Protection Engrs Grp (3)

iec 61850 7:44 PM – Messages and calls are end-to-end encrypted. No one outside of this chat, not even WhatsApp, can read or listen to them. Tap to learn more.
iec 61850 8:45 PM X1: Arpen Goyal Business development manager
EPC of substation/Switchyard AIS/GIS in India.
iec 61850 8:47 PM X1: Srex Power India
iec 61850 8:47 PM X1: I want to learn substation design.Please share if you have any data.
iec 61850 8:50 PM X2: Single line diagram
iec 61850 8:50 PM X2: Please share information
iec 61850 10:13 PM X2: Welcome all Engineers
iec 61850 12:24 AM X3: Thanks a lot🙏
iec 61850 6:09 AM X4: hello everyone..
iec 61850 6:14 AM X5: Hello! I am an Electrical Engineer with experience in OPGW. I work with OPGW there is 15 years here in the Brazil.
iec 61850 8:09 AM X6: Only for India#
iec 61850 8:26 AM X7: Fine bro…👍
iec 61850 11:42 AM X8: What is different b/w phase idmt and earth idmt can enyone explain? Please
iec 61850 11:43 AM X9: Idmt clear itself… whatever your fault o/c or E/f……it will take tripping time according to your curve that’s it
iec 61850 11:47 AM X10: Anayone have the settings calculation file of micom p443, p642, p132, p141, relays?
iec 61850, 12:01 PM X11: What type of issues in relay communication
iec 61850, 12:08 PM X12: Earth Idmt will check & operate based on neutral current…. Whereas phase Idmt will check phase current
iec 61850, 12:13 PM X9: Buddy but it’s IDMT that’s why it operate according to curve
iec 61850, 12:14 PM X8: How can I set or calculate tripping time
iec 61850, 12:15 PM X9:
iec 61850, 12:22 PM X12: How can calculate fault current & distance In line?
iec 61850, 1:58 PM X12: which relay do you have?
iec 61850, 2:03 PM X12: This message was deleted
iec 61850, 2:07 PM X12:
iec 61850, 2:07 PM X12: follows an article that can help you👆🏾
iec 61850, 2:09 PM X12: Alstom p444 (m1) ABB rel670 (m2)
iec 61850, 2:10 PM X13: Any body please provide IES, IS code for Electrical Operation and maintenance and project work
iec 61850, 3:02 PM X14: Alstom p444 (m1)ABB rel670 (m2)
For me allso the setting calculation. Thanks
iec 61850, 3:04 PM X14: Could you please share another protection guideline?
iec 61850, 3:11 PM X1: https://www.linkedin.com/posts/naveen-navab_transmission-newzealand-electricity-ugcPost-6714353347706544128-2O4x
iec 61850, 6:39 PM X1: Hi everyone
My self Naveen Kumar
Currently working as Sr. Engineer(Electrical & Automation)
I want to change job in O&M
Location :- noida, delhi, gurgaon, haryana, punjab, rajasthan.
Please find attached CV for more details.
iec 61850, 10:45 AM – X6: This message was deleted
iec 61850, 10:46 AM – X6: Only for India#
iec 61850, 11:35 AM X14: 👍👍👍👍👍
iec 61850, 12:40 PM X12: ??
iec 61850, 12:41 PM X12: ??
iec 61850, 12:58 PM X1: This message was deleted
iec 61850, 1:03 PM X1: Hi Friends..good day..one query related VT usage with Ups..As per micron P127 manual ,advise VT to use connect with relay(pic attached above)..but our customer need to use UPS (110 vac)..what are the issue if we use with UPS..Any ideas or advice on this.
iec 61850, 1:17 PM X14: Did you ensure, May they mean is UPS for Aux power Supply?
iec 61850, 1:19 PM X14: VT terminal is for measure sensing Voltage
iec 61850, 1:20 PM X14: For measuring and protection
iec 61850, 1:21 PM X1: Shall I clear when ClientWant to use UPS Power?
iec 61850, 1:21 PM X1: I mean on VT terminal or Aux. power Supply?
iec 61850, 1:22 PM X14: Aux Power Supply
iec 61850, 1:22 PM X14: You can check function that terminal on manual
iec 61850, 1:22 PM X4: Aux supply you can use ups supply but vt connection is 3phase supply only
iec 61850, 1:23 PM X1: Yup… If we use Aux Power Supply by UPS.. in that case… You can… But In VT connection, we must use by 3 Phase Supply only…
iec 61850, 1:32 PM X14: P127 is usable for voltage protection also. So, VT terminal should be direct to Source+VT connection.
But, without Aux supply, this terminal VT fuction is for power supply also.
iec 61850, 1:41 PM X14: You dont need to clearly..😄
iec 61850, 1:42 PM X14: This message was deleted
iec 61850, 1:45 PM X4: Hello Everyone,
I am Sanjeev Kumar from New Delhi, India.
Currently i am working as an Electrical Engineer in Reliance Infra.(BSES Limited, New Delhi).
I have 6+ Year Experience in Electricity Distribution Utility.
Now, I am looking to Switch Job preferably in Distribution Utility worldwide, Switchgear and Transformer manufacturer and any Project handling company.
Available to re- locate.
May please view my profile.
https://www.linkedin.com/in/er-sanjeev-kumar-kamboj-799646b2
iec 61850, 1:47 PM X14: Hi Mr. Sanjeev,
Let’s make networking,
My profile here
https://www.linkedin.com/in/rio-wijayantogt
iec 61850, 1:51 PM X1: They mean for PT supply
iec 61850, 1:53 PM X1: Yes they want to use Ups instead of VT supply..what are the issue will be there or what are the thing need to check before use(like phase angle need to check etc..)UPS SUPPLY ..
iec 61850, 1:55 PM X1: Any one have experience with this ?
iec 61850, 6:31 PM X2: In ur diagram there is no VT ckt used. 33,34 Is for aux voltage. All other in ckt are Ct connection . U can use aux voltage as DC or AC . Check the mannual for more.
iec 61850, 6:39 PM X4: Yes
iec 61850, 6:39 PM X4: There is no VT
iec 61850, 6:39 PM X4: UPS supply might be for Auxiliary
iec 61850, 6:42 PM X1: Yes I answered them ..actually they use VT 110VAc to 110vdc Ups..I discussed with Rio in this group
iec 61850, 6:42 PM X1: I missed to take full picture correct
iec 61850, 6:43 PM X1: Asked them to double check angle and magnitude are same before connect. Just to ensure
iec 61850, 8:18 PM X1: https://chat.whatsapp.com/HQckchvRLNT2ichp32Ly2d
iec 61850, 8:59 PM X14: Any one knows the RET670 relay site testting plz let me know
iec 61850, 9:03 PM X14: Make your list of actived protection & control logic list. Then test control & test protection with secondary inject current.
iec 61850, 9:14 PM X4: Hi frnds can anyone say what is resistive reach and residual compensation in distance protection?
iec 61850, 9:18 PM X14: How to test I need step by step guide an have any link or dacuments
iec 61850, 9:20 PM X10: Residual compensation factor used for calculations of ground impedance when we have earth fault on line
iec 61850, 9:22 PM X10: For earth fault we have conductor imp+ground impedance.. Relay must factor out the ground impedance out of total impedance that it is seeing
iec 61850, 9:23 PM X4: How do we know residual compensation factor? Do we have to calculate?
iec 61850, 9:23 PM X10: If someone can explain resisive and reactance reach that would be nice
iec 61850, 9:24 PM X14: https://library.e.abb.com/public/88ec8946d3424165995004c51fe9234a/1MRK504140-UEN_B_en_Commissioning_manual__Transformer_protection_RET670_2.0__IEC.pdf
iec 61850, 9:24 PM X10: (Zo x Z1)/3Z1
iec 61850, 9:25 PM X10: Relay uses above formula to calculate it
iec 61850, 9:26 PM X4: 👍bro tq
iec 61850, 9:26 PM X5: 1. pick up each phase and three phase on HV and LV winding Slope 1 & 2 Characteristics Internal and External Fault Test 2nd & 5th Harmonic Test Zero Filter Sequence Test
iec 61850, 9:27 PM X14: 👍
iec 61850, 9:27 PM X10: https://www.youtube.com/watch?v=HgxL0GPPZ_A&t=1374s. Exactly what u need
iec 61850, 9:30 PM X10: But we have to put the values in settings… Relay does not calculate itself
iec 61850, 9:33 PM X5: Resistive test is used to simulate the resistive fault (Fault angle=0°) happened to the conductor.
Each Zone of protection has a different Resistive Reach (Phase – Ground & Phase- Phase)
iec 61850, 9:37 PM – X10: 👍🏻
iec 61850, 9:40 PM X5:
iec 61850, 9:42 PM X5: Thats why we need to make sure that the resistive fault test still belongs to each coverance protection area
iec 61850, 12:41 AM X5: Thank you
iec 61850, 5:33 AM X10: 👍🏻
iec 61850, 8:53 AM X14: Thanks furqan…
iec 61850, 8:54 AM X10: Welcome
iec 61850, 9:09 AM X5:
iec 61850, 9:30 AM X5:
iec 61850, 9:31 AM X5: OPGW
iec 61850, 11:52 AM X10: Can we use abb wavewin software for analysis of schneider micom relay disturbance record?
iec 61850, 11:54 AM X1: Yes hope that will work since all are comtrade format
iec 61850, 11:57 AM – X10: 👍
iec 61850, 12:04 PM X5:
iec 61850, 3:04 PM X5:
iec 61850, 3:04 PM X5: What is DOCK 2 station?
iec 61850, 3:27 PM X5 Chatterjee: Hi , This is Sudipta.
iec 61850, 3:27 PM X5 Chatterjee: Hi ,I am looking for Relay setting calculation for Multifunction Relays
1). Transformer Protection Relays 2). Switchgear – MV Protection Relays for Motors , cable feeders .3). Generator protection Relays
Appreciate that final setting ( Time Setting & Plug Setting ) shall finally depend on the manufacturer’s relay characteristics.
iec 61850, 3:27 PM X5: PM me
iec 61850, 3:28 PM X5 Chatterjee: Ok , man thanks 🙏 for inviting & connecting to me
iec 61850, 3:28 PM X5: 👍
iec 61850, 3:33 PM X4: Hi could you send me those calculations
iec 61850, 3:36 PM X5 Chatterjee: I have been told that it is available on chargeable basis .
iec 61850, 3:36 PM X5: Yes it is on chargeable basis… knowledge is not for free.
iec 61850, 3:37 PM X4: Omg
iec 61850, 3:37 PM X4: Will support you for the same!!
iec 61850, 3:42 PM X5: Bcoz people only value when it is earned otherwise…all free materials are taken as granted
iec 61850, 3:42 PMX5: Sir, Read relay manual maximum setting calculation given in the manual….
iec 61850, 3:45 PMX5: If share the knowlegde you will be gain bro….
iec 61850, 3:46 PM X5: Doing it from past 20 years
iec 61850, 3:47 PM X1: 👍🏻
iec 61850, 3:47 PM X4: 👍
iec 61850, 3:48 PM X5 Chatterjee: I am looking for Relay setting calculation for Multifunction Relays
1). Transformer Protection Relays
2). Switchgear – MV Protection Relays for Motors , cable feeders .
3). Generator protection Relays
Appreciate that final setting ( Time Setting & Plug Setting ) shall finally depend on the manufacturer’s relay characteristics.
iec 61850, 3:49 PM X14: Related with your electricity network and operation
iec 61850, 3:51 PM X14: I am waiting some one share more detail’s..
iec 61850, 3:58 PM X4: Can we check o/c pick up in idmt curve?
iec 61850, 3:59 PM X14: Yes we can
iec 61850, 4:00 PM X4: How to do that? Can u say
iec 61850, 4:03 PM X14: Do you have calculation relay protection test in check list sheet?
iec 61850, 4:03 PM X4: No
iec 61850, 4:05 PM X5 Chatterjee: My one of the queries –
How much offset we can allow for big transformer differential protection ?
Is it 10 percent of the differential current ?
iec 61850, 4:07 PM X14: https://www.slideshare.net/mobile/RobertoCosta22/sample-calculationfordifferentialrelays#:~:text=Calculations%20for%20OLTC%20tap%20setting,on%20CT%20Secondary%20(HV)%2F
iec 61850, 4:10 PM X14: Please find it in your organization, you can check in FAT report, or Protection Check list.
iec 61850, 4:12 PMX13: Please tell me. IS code for BDV TESTING and how much value according to IS or IES
iec 61850, 4:24 PMX5: 20 percentage
iec 61850, 4:24 PMX5: Its safe
iec 61850,

iec 61850 7:44 PM – Messages and calls are end-to-end encrypted. No one outside of this chat, not even WhatsApp, can read or listen to them. Tap to learn more.
iec 61850 8:45 PM X1: Arpen Goyal Business development manager
EPC of substation/Switchyard AIS/GIS in India.
iec 61850 8:47 PM X1: Srex Power India
iec 61850 8:47 PM X1:
iec 61850 8:47 PM X1: I want to learn substation design.Please share if you have any data.
iec 61850 8:50 PM X2: Single line diagram
iec 61850 8:50 PM X2: Please share information
iec 61850 10:13 PM X2: Welcome all Engineers
iec 61850 10:14 PM X2: @919445001523 how r u brother
iec 61850 12:24 AM X3: Thanks a lot🙏
iec 61850 6:09 AM X4: hello everyone..
iec 61850 6:14 AM X5: Hello! I am an Electrical Engineer with experience in OPGW. I work with OPGW there is 15 years here in the Brazil.
iec 61850 8:09 AM X6: Only for India#
iec 61850 8:26 AM X7: Fine bro…👍
iec 61850 11:42 AM X8: What is different b/w phase idmt and earth idmt can enyone explain? Please
iec 61850 11:43 AM X9: Idmt clear itself… whatever your fault o/c or E/f……it will take tripping time according to your curve that’s it
iec 61850 11:47 AM X10: Anayone have the settings calculation file of micom p443, p642, p132, p141, relays?
iec 61850, 12:01 PM X11: What type of issues in relay communication
iec 61850, 12:08 PM X12: Earth Idmt will check & operate based on neutral current…. Whereas phase Idmt will check phase current
iec 61850, 12:13 PM X9: Buddy but it’s IDMT that’s why it operate according to curve
iec 61850, 12:14 PM X8: How can I set or calculate tripping time
iec 61850, 12:15 PM X9:
iec 61850, 12:22 PM X12: How can calculate fault current & distance In line?
iec 61850, 1:58 PM X12: which relay do you have?
iec 61850, 2:03 PM X12: This message was deleted
iec 61850, 2:07 PM X12:
iec 61850, 2:07 PM X12: follows an article that can help you👆🏾
iec 61850, 2:09 PM X12: Alstom p444 (m1) ABB rel670 (m2)
iec 61850, 2:10 PM X13: Any body please provide IES, IS code for Electrical Operation and maintenance and project work
iec 61850, 3:02 PM X14: Alstom p444 (m1)ABB rel670 (m2)
For me allso the setting calculation. Thanks
iec 61850, 3:04 PM X14: Could you please share another protection guideline?
iec 61850, 3:11 PM X1: https://www.linkedin.com/posts/naveen-navab_transmission-newzealand-electricity-ugcPost-6714353347706544128-2O4x
iec 61850, 6:39 PM X1: Hi everyone
My self Naveen Kumar
Currently working as Sr. Engineer(Electrical & Automation)
I want to change job in O&M
Location :- noida, delhi, gurgaon, haryana, punjab, rajasthan.
Please find attached CV for more details.
iec 61850, 10:45 AM – X6: This message was deleted
iec 61850, 10:46 AM – X6: Only for India#
iec 61850, 11:35 AM X14: 👍👍👍👍👍
iec 61850, 12:40 PM X12: ??
iec 61850, 12:41 PM X12: ??
iec 61850, 12:58 PM X1: This message was deleted
iec 61850, 12:58 PM X1:
iec 61850, 1:03 PM X1: Hi Friends..good day..one query related VT usage with Ups..As per micron P127 manual ,advise VT to use connect with relay(pic attached above)..but our customer need to use UPS (110 vac)..what are the issue if we use with UPS..Any ideas or advice on this.
iec 61850, 1:17 PM X14: Did you ensure, May they mean is UPS for Aux power Supply?
iec 61850, 1:19 PM X14: VT terminal is for measure sensing Voltage
iec 61850, 1:20 PM X14: For measuring and protection
iec 61850, 1:21 PM X1: Shall I clear when ClientWant to use UPS Power?
iec 61850, 1:21 PM X1: I mean on VT terminal or Aux. power Supply?
iec 61850, 1:22 PM X14: Aux Power Supply
iec 61850, 1:22 PM X14: You can check function that terminal on manual
iec 61850, 1:22 PM X4: Aux supply you can use ups supply but vt connection is 3phase supply only
iec 61850, 1:23 PM X1: Yup… If we use Aux Power Supply by UPS.. in that case… You can… But In VT connection, we must use by 3 Phase Supply only…
iec 61850, 1:32 PM X14: P127 is usable for voltage protection also. So, VT terminal should be direct to Source+VT connection.
But, without Aux supply, this terminal VT fuction is for power supply also.
iec 61850, 1:41 PM X14: You dont need to clearly..😄
iec 61850, 1:42 PM X14: This message was deleted
iec 61850, 1:45 PM X4: Hello Everyone,
I am Sanjeev Kumar from New Delhi, India.
Currently i am working as an Electrical Engineer in Reliance Infra.(BSES Limited, New Delhi).
I have 6+ Year Experience in Electricity Distribution Utility.
Now, I am looking to Switch Job preferably in Distribution Utility worldwide, Switchgear and Transformer manufacturer and any Project handling company.
Available to re- locate.
May please view my profile.
https://www.linkedin.com/in/er-sanjeev-kumar-kamboj-799646b2
iec 61850, 1:47 PM X14: Hi Mr. Sanjeev,
Let’s make networking,
My profile here
https://www.linkedin.com/in/rio-wijayantogt
iec 61850, 1:51 PM X1: They mean for PT supply
iec 61850, 1:53 PM X1: Yes they want to use Ups instead of VT supply..what are the issue will be there or what are the thing need to check before use(like phase angle need to check etc..)UPS SUPPLY ..
iec 61850, 1:55 PM X1: Any one have experience with this ?
iec 61850, 6:31 PM X2: In ur diagram there is no VT ckt used. 33,34 Is for aux voltage. All other in ckt are Ct connection . U can use aux voltage as DC or AC . Check the mannual for more.
iec 61850, 6:39 PM X4: Yes
iec 61850, 6:39 PM X4: There is no VT
iec 61850, 6:39 PM X4: UPS supply might be for Auxiliary
iec 61850, 6:42 PM X1: Yes I answered them ..actually they use VT 110VAc to 110vdc Ups..I discussed with Rio in this group
iec 61850, 6:42 PM X1: I missed to take full picture correct
iec 61850, 6:43 PM X1: Asked them to double check angle and magnitude are same before connect. Just to ensure
iec 61850, 8:18 PM X1: https://chat.whatsapp.com/HQckchvRLNT2ichp32Ly2d
iec 61850, 8:59 PM X14: Any one knows the RET670 relay site testting plz let me know
iec 61850, 9:03 PM X14: Make your list of actived protection & control logic list. Then test control & test protection with secondary inject current.
iec 61850, 9:14 PM X4: Hi frnds can anyone say what is resistive reach and residual compensation in distance protection?
iec 61850, 9:18 PM X14: How to test I need step by step guide an have any link or dacuments
iec 61850, 9:20 PM X10: Residual compensation factor used for calculations of ground impedance when we have earth fault on line
iec 61850, 9:22 PM X10: For earth fault we have conductor imp+ground impedance.. Relay must factor out the ground impedance out of total impedance that it is seeing
iec 61850, 9:23 PM X4: How do we know residual compensation factor? Do we have to calculate?
iec 61850, 9:23 PM X10: If someone can explain resisive and reactance reach that would be nice
iec 61850, 9:24 PM X14: https://library.e.abb.com/public/88ec8946d3424165995004c51fe9234a/1MRK504140-UEN_B_en_Commissioning_manual__Transformer_protection_RET670_2.0__IEC.pdf
iec 61850, 9:24 PM X10: (Zo x Z1)/3Z1
iec 61850, 9:25 PM X10: Relay uses above formula to calculate it
iec 61850, 9:26 PM X4: 👍bro tq
iec 61850, 9:26 PM X5: 1. pick up each phase and three phase on HV and LV winding

  1. Slope 1 & 2 Characteristics
  2. Internal and External Fault Test
  3. 2nd & 5th Harmonic Test
  4. Zero Filter Sequence Test
    iec 61850, 9:27 PM X14: 👍
    iec 61850, 9:27 PM X10: https://www.youtube.com/watch?v=HgxL0GPPZ_A&t=1374s. Exactly what u need
    iec 61850, 9:30 PM X10: But we have to put the values in settings… Relay does not calculate itself
    iec 61850, 9:33 PM X5: Resistive test is used to simulate the resistive fault (Fault angle=0°) happened to the conductor.
    Each Zone of protection has a different Resistive Reach (Phase – Ground & Phase- Phase)
    iec 61850, 9:37 PM – X10: 👍🏻
    iec 61850, 9:40 PM X5:
    iec 61850, 9:42 PM X5: Thats why we need to make sure that the resistive fault test still belongs to each coverance protection area
    iec 61850, 12:41 AM X5: Thank you
    iec 61850, 5:33 AM X10: 👍🏻
    iec 61850, 8:53 AM X14: Thanks furqan…
    iec 61850, 8:54 AM X10: Welcome
    iec 61850, 9:09 AM X5:
    iec 61850, 9:30 AM X5:
    iec 61850, 9:31 AM X5: OPGW
    iec 61850, 11:52 AM X10: Can we use abb wavewin software for analysis of schneider micom relay disturbance record?
    iec 61850, 11:54 AM X1: Yes hope that will work since all are comtrade format
    iec 61850, 11:57 AM – X10: 👍
    iec 61850, 12:04 PM X5:
    iec 61850, 3:04 PM X5:
    iec 61850, 3:04 PM X5: What is DOCK 2 station?
    iec 61850, 3:27 PM X5 Chatterjee: Hi , This is Sudipta.
    iec 61850, 3:27 PM X5 Chatterjee: Hi ,I am looking for Relay setting calculation for Multifunction Relays
    1). Transformer Protection Relays 2). Switchgear – MV Protection Relays for Motors , cable feeders .3). Generator protection Relays
    Appreciate that final setting ( Time Setting & Plug Setting ) shall finally depend on the manufacturer’s relay characteristics.
    iec 61850, 3:27 PM X5: PM me
    iec 61850, 3:28 PM X5 Chatterjee: Ok , man thanks 🙏 for inviting & connecting to me
    iec 61850, 3:28 PM X5: 👍
    iec 61850, 3:33 PM X4: Hi could you send me those calculations
    iec 61850, 3:36 PM X5 Chatterjee: I have been told that it is available on chargeable basis .
    iec 61850, 3:36 PM X5: Yes it is on chargeable basis… knowledge is not for free.
    iec 61850, 3:37 PM X4: Omg
    iec 61850, 3:37 PM X4: Will support you for the same!!
    iec 61850, 3:42 PM X5: Bcoz people only value when it is earned otherwise…all free materials are taken as granted
    iec 61850, 3:42 PMX5: Sir, Read relay manual maximum setting calculation given in the manual….
    iec 61850, 3:45 PMX5: If share the knowlegde you will be gain bro….
    iec 61850, 3:46 PM X5: Doing it from past 20 years
    iec 61850, 3:47 PM X1: 👍🏻
    iec 61850, 3:47 PM X4: 👍
    iec 61850, 3:48 PM X5 Chatterjee: I am looking for Relay setting calculation for Multifunction Relays
    1). Transformer Protection Relays
    2). Switchgear – MV Protection Relays for Motors , cable feeders .
    3). Generator protection Relays
    Appreciate that final setting ( Time Setting & Plug Setting ) shall finally depend on the manufacturer’s relay characteristics.
    iec 61850, 3:49 PM X14: Related with your electricity network and operation
    iec 61850, 3:51 PM X14: I am waiting some one share more detail’s..
    iec 61850, 3:58 PM X4: Can we check o/c pick up in idmt curve?
    iec 61850, 3:59 PM X14: Yes we can
    iec 61850, 4:00 PM X4: How to do that? Can u say
    iec 61850, 4:03 PM X14: Do you have calculation relay protection test in check list sheet?
    iec 61850, 4:03 PM X4: No
    iec 61850, 4:05 PM X5 Chatterjee: My one of the queries –
    How much offset we can allow for big transformer differential protection ?
    Is it 10 percent of the differential current ?
    iec 61850, 4:07 PM X14: https://www.slideshare.net/mobile/RobertoCosta22/sample-calculationfordifferentialrelays#:~:text=Calculations%20for%20OLTC%20tap%20setting,on%20CT%20Secondary%20(HV)%2F
    iec 61850, 4:10 PM X14: Please find it in your organization, you can check in FAT report, or Protection Check list.
    iec 61850, 4:12 PMX13: Please tell me. IS code for BDV TESTING and how much value according to IS or IES
    iec 61850, 4:24 PMX5: 20 percentage
    iec 61850, 4:24 PMX5: Its safe
    iec 61850, 4:24 PM X4: Okkk
    iec 61850, 4:43 PM X4:
    iec 61850, 5:37 PM X4: Pls send me also
    iec 61850, 7:16 PMX4: Serial number 2 mentioned in wrong place
    iec 61850, 7:20 PMX13: How to connect solid earthing in Transformer
    iec 61850, 8:18 PM X5 Chatterjee: You need to connect star side neutral to the ground ( without adding any additional resistance ) .
    Thus you allow more earth fault current to flow in the the system ( through the neutral during earth fault ) so that earth fault protection relays can operate .
    TNCS and TNS can be an option .
    LV systems ( 415 volt ) normally has this type of solid earthing ( excepting offshore -FPSO & offshore Drilling ships ).
    Neutral earthing ( System earthing itself is a big subject .
    Please try to read Protection Relay Books ( like PRAG – Alstom ).
    iec 61850, 8:20 PM X1: https://www.se.com/ww/en/download/document/EIGED306001EN/
    iec 61850, 8:20 PM X1: This may be helpful for you
    iec 61850, 8:22 PMX13: Thanks
    iec 61850, 8:39 PM X5 Chatterjee: This Schneider one is the most lucid one to under the different system grounding methods and the respective protection systems .
    iec 61850, 8:39 PM X5 Chatterjee: * sorry , the most lucid one to understand.
    iec 61850, 9:25 PM X1: 👍
    iec 61850, 11:54 PM – X2: Why we use DEF protection in line protection ?
    In ABB line protection relays why we have additional graphs like phase sequence ?
    Which parameters are important and affect our calulcation for length of the line? For example what is the ground impedence for small lines and what are its effect when compared with big lines ?
    iec 61850, 11:55 PM – X2: In case of 3 CTs how do we connect in relays let say if we have one half breaker scheme on one side and double bus on other side then we have 3 CTs
    iec 61850, 11:56 PM X6: For small lines and ug cable feeder differential protection required
    iec 61850, 4:21 AM X4: Please send me how to calculate protection setting calculations
    iec 61850, 5:00 AMX5: Kindly refer manual respective relay manufacture ….
    iec 61850, 6:06 AM – X4: shall we use line DEF for 4.7 km line.. what should be settings for both ends?? terminating side, in existing bays line distance is there. can we use line DEF in our upcoming bays on terminating side??
    iec 61850, 6:06 AM – X4: Anybody have documents, calculations, settings for line def?? request to share
    iec 61850, 8:00 AM – Kammar:
    iec 61850, 1:40 PM X14: Hi, I need some material (relay) scheineder, for project in qatar. If any some one interest to quot with beautifull price, please PM.
    iec 61850, 1:53 PM X1: Can I refer to team Schneider Gulf. You may contact my colleague Mr.jogendra solengi (jogendra.solengi@se.com)
    iec 61850, 1:54 PM X1: You can ref my name and he will route to the right team internally to support you there
    iec 61850, 1:54 PM X14: Okay thank’s Bro
    iec 61850, 1:55 PM X1: You are welcome bro👍
    iec 61850, 2:10 PM X4 joined using this group’s invite link
    iec 61850, 2:14 PM X4: Good day. I am Stephen Chakhwantha, Electrical Engineer from Malawi.
    iec 61850, 2:39 PM X4:
    iec 61850, 2:39 PM X4: who can assist why i have this error trying to write to the IED
    iec 61850, 2:41 PM – X9: I think graphical display not matching
    iec 61850, 2:43 PM X1: I think dowload latest connectivity package
    iec 61850, 2:43 PM – +62 811-7003-313 joined using this group’s invite link
    iec 61850, 2:44 PM X4: Thanks all let me check
    iec 61850, 2:44 PM X4: Agree, please try to change from HW configurator
    iec 61850, 2:54 PM X4:
    iec 61850, 2:57 PM – X10: Restarting your pc, or using 64 bit versions and vice versa might help
    iec 61850, 3:03 PM X4:
    iec 61850, 3:03 PM X4: Anyone know this password
    iec 61850, 3:03 PM X4: Plss tel me
    iec 61850, 3:03 PM X4: please send screenshot of your Hardware Configuration window
    iec 61850, 3:05 PM X14: Try to Enter the default
    password “ChangeMe1#
    iec 61850, 3:07 PM X4: Av changed the display type and its working…however I have another error of Rolling back Transaction
    iec 61850, 3:07 PM X4: while trying to write to the IED
    iec 61850, 3:08 PM X4: no coming its sowing wrong password
    iec 61850, 3:08 PM X4: great, any description why?
    iec 61850, 3:10 PM X14: I think someone may be has changed password already
    iec 61850, 3:11 PM X4: now only i installed that software
    iec 61850, 3:11 PM X4: use “ChangeMe1# without “, just ChangeMe1#
    iec 61850, 3:12 PM X4:
    iec 61850, 3:15 PM X14: You can try access bypass password with supervisory level also when password cannot be accessed.
    iec 61850, 3:18 PM X4: i cant able to open the software to change
    iec 61850, 3:21 PM X14: Did you try enable supervisory level without software in the IED screen?
    iec 61850, 8:13 PM X4: How much the minimum value of A for the breaker contact résistance hd4?
    iec 61850, 7:24 AM X4 joined using your invite
    iec 61850, 7:24 AM X4: Thank you.
    iec 61850, 7:36 AM – AA : How can I calculate the distance relay apparent z for 1ph to ground fault using PSSE file?
    iec 61850, 9:31 AM X14: I never found this standard. Did used standard of balance RST for determinated condition.
    iec 61850, 9:33 AM X14: #determine
    iec 61850, 12:09 PM – AA : Do any one have an excel sheets to calculate the distance settings?
    iec 61850, 1:43 PM X6: R phase 90 a
    Y phase 60 a
    B phase 90 a
    N = ? a
    iec 61850, 4:01 PM X4 “: What about angles?
    iec 61850, 4:10 PM X6: 0,120,240
    iec 61850, 4:31 PM – KK 1234 Mochamad Effendi: You Can Calculate symmetrical component formula..
    iec 61850, 4:41 PM X6: How
    iec 61850, 4:45 PM X4: This message was deleted
    iec 61850, 4:52 PM X6 joined using this group’s invite link
    iec 61850, 8:38 PM – You added kk 1369 Aravind S
    iec 61850, 8:47 PM X6 joined using this group’s invite link
    iec 61850, 10:32 PM X4 “: 30 <150°
    iec 61850, 10:27 AM X4: Hii any one share me document for bus bar caluclation 50ka per one second copper bus bar
    iec 61850, 10:31 AM X5 Chatterjee: It will be based on I^2t , where I is the RMS breaking current ( not Making current capacity , which is higher ).
  5. Busbar bracing will be sized based on Making current capacity Ip( Ip- Ist cycle capacity , or, Making capacity) .
  6. Note – I do not have the formulae handy , as I am travelling now .
  7. iec 61850, 10:36 AM – X8: Can I find the CT ratio with the help of secondary injection
  8. iec 61850, 11:54 AM X6: May I know the calculations details
  9. iec 61850, 12:05 PM X5 Chatterjee: What is meant by 30 <150° ????
  10. iec 61850, 3:59 PM X6: This message was deleted
  11. iec 61850, 4:25 PM X5 Chatterjee: Please tell me one answer –
  12. Motor full load current – 300 Amps
  13. My question is –
  14. 1). What will be current setting and how you will set it ?
  15. 2). And how will you set dial for current ?
  16. Please explain ?
  17. iec 61850, 4:35 PM X6: What kind of relay do you have ?
  18. iec 61850, 4:35 PM X4: For instance you will set according to (locked rotor current)1.1-1.5 (depends on type of relay) sorry but it’s hard to explain it in english for me, i’m native kazakh and russian, and learned relay protection in russian iec 61850, 4:36 PM X5 Chatterjee: It’s multifunction digital MICOM relays . iec 61850, 4:36 PM X6: Over current setting is 110% that means 330A setting iec 61850, 4:36 PM X11: How to check relay communicate or not iec 61850, 4:36 PM X6: Then super iec 61850, 4:37 PM X6: Keep Isc current is 3full load current that means 900A
  19. iec 61850, 4:38 PM X6: Locker Rotor or blocked rotor setting is 6*full load current that mean 1800A with minimum trip setting like in 150mSec
  20. iec 61850, 4:38 PM X6: E/F keep 30A with IDMT curve base
  21. iec 61850, 4:40 PM X6: Time should be very very minimum
  22. iec 61850, 4:41 PM X4: It’s common value, lrc can be different, you have to clarify, if it’s without any resistors it can be more 6
  23. iec 61850, 4:42 PM X6: If you are move to below 6times Of current you will receive frequent trip from the motor..also we need to study what kind of load on the motor..fluid or hard load..need to be considered..
  24. iec 61850, 4:42 PM X4: Exactly
  25. iec 61850, 4:43 PM X6: Thanks yaani
  26. iec 61850, 4:45 PM X4: Where did you see this rules? I see it first time, could you please send source
  27. iec 61850, 4:46 PM X6: This message was deleted
  28. iec 61850, 4:48 PM X6: By experience yaani
  29. iec 61850, 4:48 PM X6: You need to see what kind of starting method is used. Accordingly you can set highset for the motor.
  30. iec 61850, 4:49 PM X6: But we need to more deep with time..
  31. iec 61850, 4:50 PM X6: Time we need to keep little bit higher then locked rotor
  32. iec 61850, 4:56 PMX6: For blowers starting time will b more
  33. iec 61850, 4:59 PM X4: My opinion, Isc calculated diffently and based on power source, I see calculation like this first time🤷🏻‍♂️
  34. iec 61850, 5:13 PM X6: That’s why I mentioned we need to concentrate with time and upstream settings
  35. iec 61850, 5:30 PM X5 Chatterjee: 1). Please tell me one answer –
  36. Motor full load current – 300 Amps
  37. My question is –
  38. a). What will be the current setting and how you will set it ?
  39. b). And how will you set dial for current ?
  40. Please explain ?

2). In VFD – how will you set the timing of “ Catch the Spinning loads and how you can control that based on type loads ?

3). How will see Fraon in Dissolve gas analysis of transformer Oil ?

4). In Dissolve Gas Analysis –
a), if we get more Hydrogen, then what will be type of transformer fault ?
b). In dissolve gas analysis , what are the gases / chemical we obtain from this analysis ?

5) In GIS , what are the check you do for SF6 gas ?

Gas Density meters , Pressure , SF6 Dew Point & SF6 PPM .

6). What is difference between Low Impedance differential and High Impedance Differential Relays?

7). What are the advantages of high impedance differential relays ? Through stabilizing resistor , it can limit the external fault current .
This relay has got more stability .

8) . How would you detect and handle if there is CT saturation in Low Impedance Relays ?

9). What are the two modes of Generator AVR operation –
a). Voltage control
b). Power Factor Control .

10). How you will migrate from 132 kV in to 220 kV system ? Describe the operation .

Sudipta Chatterjee
iec 61850, 5:53 PM X6: There r the interview questions or any exam based question???
iec 61850, 5:54 PM – X10: Can we perform c&df test on PT? not asking aboit CVT.
iec 61850, 6:08 PM X14: This message was deleted
iec 61850, 6:10 PM X14: This message was deleted
iec 61850, 6:16 PM X5 Chatterjee: This is right answer for overload setting , my fiends .
iec 61850, 6:18 PM X14: This message was deleted
iec 61850, 6:19 PM X14: This message was deleted
iec 61850, 6:58 PM X14: Wait, I trying to calculate… 😁🙏
iec 61850, 6:58 PM X6: Anybody are working with E-Plan or have any knowledge about it ?
iec 61850, 6:59 PM X4: Hii this manjunatha i have 7 years experience in eplan
iec 61850, 6:59 PM X4: Tel me sir
iec 61850, 6:59 PM X6: I need some help
Can i dm you !
iec 61850, 6:59 PM X6: ?
iec 61850, 7:00 PM X4: Yes tel me sir
iec 61850, 7:00 PM X4: What help u needed
iec 61850, 7:01 PM X6: I am new to eplan so i want to learn more about E-PLAN
iec 61850, 7:02 PM – KK 1233 BHUVANESH KUMAR left
iec 61850, 7:02 PM X4: U have eplan software
iec 61850, 7:02 PM X6: Yes
iec 61850, 7:03 PM X4: 7829698334 this my no u can WhatsApp or cal me
iec 61850, 7:03 PM X4: When you dout
iec 61850, 7:11 PM X6: Ok
iec 61850, 7:17 PMX13: Hello everyone
I have 4yr experience in solar o&m department. But we want learn etap and solar design. Substation design please any update me about this .
iec 61850, 7:40 PM X5: This message was deleted
iec 61850, 8:39 PM X14: easiest to answer….. 9). What are the two modes of Generator AVR operation –
a). Voltage control. This setting field is used to enter the desired generator output terminal voltage. The AVR setpoint value range depends on the regulator sensing voltage and band setting.
b). Power Factor Control . The PF Setpoint determines the level of generator power factor maintained
iec 61850, 11:07 PM – X10: How to test an anti pumping relay of HV CB?
iec 61850, 12:33 AM X6: If you push the CB ON button(cb should close) and then while the ON button is still pressed push the CB OFF button(or give protection trip) simultaneously then even after spring charge CB will not close. Also when the CB is closed u can see that when CB ON button is pressed, anti-pumping relay will pickup.
iec 61850, 6:19 AM – X10: Got it… Exactly what i wanted to know. Thanks
iec 61850, 7:58 AM X5 Chatterjee: I have got few below questions for which I do not have clear responses.
Would anybody try to help me ?
1). What’s the main function of Pole Discrepancy Relays ?
2). How does Brushless Generator operate without brushes ?
3). In Transformer Gas Analysis , if H2 is more then what’s the type of transformer fault you can think of ?
4). How do u detect CT saturation in Low Impedance Busbar Differential Relays ?
iec 61850, 7:58 AM X5 Chatterjee: Can anyone help me to to get the correct answers ?
iec 61850, 8:05 AM X5: Interested in PSCAD training videos PM Me
iec 61850, 8:15 AM X14: 1). Protect for circuit breaker internal mechanism failure hence the breaker poles will be closed unequally or delayed.
2). Sending voltage to build magnet in main rotor using Dioda rotating after rotor exciter.
3). Corona
4). If a CT has reached saturation, may diffential active alarm.
iec 61850, 8:17 AM X14: Corrected ?
iec 61850, 8:25 AM X14: When CT saturated, then reading will be not linear..
iec 61850, 8:34 AM X5: Dual slope characteristics won’t allow relay to Operate on CT sat.
iec 61850, 9:02 AM X5: Preferably 2nd slope😂
iec 61850, 9:05 AM – You added J 1000 1272 Intru Mr. Imran khan
iec 61850, 9:42 AM X5: 400 kV GIS operating manual?
iec 61850, 9:48 AMX5: PM me
iec 61850, 9:51 AMX5: I will give send u
iec 61850, 9:52 AM X5: Ok my gmail is sharma.jigyesh@gmail.com send me
iec 61850, 9:55 AM X6: Group send all guys help
iec 61850, 9:59 AM X6: 4). What I know about REB500 relay is that it have patent of CT saturation detection. REB500detects CT saturation, then from the distorted(saturated) current it recreate that signal.
iec 61850, 10:18 AM X4: Yes,do Plz send in group,thanks
iec 61850, 10:25 AM X14: Finally, diff alarm will be come…😀
iec 61850, 10:27 AM X14: Number 1 2 3, please your review…
iec 61850, 12:29 PM X2:
iec 61850, 12:29 PM X2: Indian standard
iec 61850, 1:12 PM – X10: 👍🏻
iec 61850, 2:25 PM – +971 58 167 0157 joined using this group’s invite link
iec 61850, 2:26 PM – AA mindia: What should be OLTC AVR relay PT Lower and raise voltage settings.
iec 61850, 2:32 PM X1:
iec 61850, 2:33 PM X5: For phase angle correction
iec 61850, 2:36 PM X1: Sir Only for phase angle or also any function of this
iec 61850, 2:39 PM – X10:
iec 61850, 2:41 PM – kk 1441 Prakash Gunasekaran: Current measuring purpose
iec 61850, 2:43 PM – X10: Yes.. But why not in every CB yatd panel… Its only installed in middle CB panel
iec 61850, 2:57 PM X6: Are u taking it personally?! I though it was a technical discussion. Anyway from my point of view differential alarm will not come at this condition(during saturation) if it is REB500. If it was internal fault it will trip, if external not.
iec 61850, 3:02 PM X6: Although without drawing/ specific picture it could not be answered, to me it looks like matching CT(Interposing CT). Check if the ration of bus CT and tie CT matches or not.

  1. X4: Okkk
    iec 61850, 4:43 PM X4:
    iec 61850, 5:37 PM X4: Pls send me also
    iec 61850, 7:16 PMX4: Serial number 2 mentioned in wrong place
    iec 61850, 7:20 PMX13: How to connect solid earthing in Transformer
    iec 61850, 8:18 PM X5 Chatterjee: You need to connect star side neutral to the ground ( without adding any additional resistance ) .
    Thus you allow more earth fault current to flow in the the system ( through the neutral during earth fault ) so that earth fault protection relays can operate .
    TNCS and TNS can be an option .
    LV systems ( 415 volt ) normally has this type of solid earthing ( excepting offshore -FPSO & offshore Drilling ships ).
    Neutral earthing ( System earthing itself is a big subject .
    Please try to read Protection Relay Books ( like PRAG – Alstom ).
    iec 61850, 8:20 PM X1: https://www.se.com/ww/en/download/document/EIGED306001EN/
    iec 61850, 8:20 PM X1: This may be helpful for you
    iec 61850, 8:22 PMX13: Thanks
    iec 61850, 8:39 PM X5 Chatterjee: This Schneider one is the most lucid one to under the different system grounding methods and the respective protection systems .
    iec 61850, 8:39 PM X5 Chatterjee: * sorry , the most lucid one to understand.
    iec 61850, 9:25 PM X1: 👍
    iec 61850, 11:54 PM – X2: Why we use DEF protection in line protection ?
    In ABB line protection relays why we have additional graphs like phase sequence ?
    Which parameters are important and affect our calulcation for length of the line? For example what is the ground impedence for small lines and what are its effect when compared with big lines ?
    iec 61850, 11:55 PM – X2: In case of 3 CTs how do we connect in relays let say if we have one half breaker scheme on one side and double bus on other side then we have 3 CTs
    iec 61850, 11:56 PM X6: For small lines and ug cable feeder differential protection required
    iec 61850, 4:21 AM X4: Please send me how to calculate protection setting calculations
    iec 61850, 5:00 AMX5: Kindly refer manual respective relay manufacture ….
    iec 61850, 6:06 AM – X4: shall we use line DEF for 4.7 km line.. what should be settings for both ends?? terminating side, in existing bays line distance is there. can we use line DEF in our upcoming bays on terminating side??
    iec 61850, 6:06 AM – X4: Anybody have documents, calculations, settings for line def?? request to share
    iec 61850, 8:00 AM – AA 7094 Veerachari Kammar:
    iec 61850, 1:40 PM X14: Hi, I need some material (relay) scheineder, for project in qatar. If any some one interest to quot with beautifull price, please PM.
    iec 61850, 1:53 PM X1: Can I refer to team Schneider Gulf. You may contact my colleague Mr.jogendra solengi (jogendra.solengi@se.com)
    iec 61850, 1:54 PM X1: You can ref my name and he will route to the right team internally to support you there
    iec 61850, 1:54 PM X14: Okay thank’s Bro
    iec 61850, 1:55 PM X1: You are welcome bro👍
    iec 61850, 2:10 PM X4 joined using this group’s invite link
    iec 61850, 2:14 PM X4: Good day. I am Stephen Chakhwantha, Electrical Engineer from Malawi.
    iec 61850, 2:39 PM X4:
    iec 61850, 2:39 PM X4: who can assist why i have this error trying to write to the IED
    iec 61850, 2:41 PM – X9: I think graphical display not matching
    iec 61850, 2:43 PM X1: I think dowload latest connectivity package
    iec 61850, 2:43 PM – +62 811-7003-313 joined using this group’s invite link
    iec 61850, 2:44 PM X4: Thanks all let me check
    iec 61850, 2:44 PM X4: Agree, please try to change from HW configurator
    iec 61850, 2:54 PM X4:
    iec 61850, 2:57 PM – X10: Restarting your pc, or using 64 bit versions and vice versa might help
    iec 61850, 3:03 PM X4:
    iec 61850, 3:03 PM X4: Anyone know this password
    iec 61850, 3:03 PM X4: Plss tel me
    iec 61850, 3:03 PM X4: please send screenshot of your Hardware Configuration window
    iec 61850, 3:05 PM X14: Try to Enter the default
    password “ChangeMe1#
    iec 61850, 3:07 PM X4: Av changed the display type and its working…however I have another error of Rolling back Transaction
    iec 61850, 3:07 PM X4: while trying to write to the IED
    iec 61850, 3:08 PM X4: no coming its sowing wrong password
    iec 61850, 3:08 PM X4: great, any description why?
    iec 61850, 3:10 PM X14: I think someone may be has changed password already
    iec 61850, 3:11 PM X4: now only i installed that software
    iec 61850, 3:11 PM X4: use “ChangeMe1# without “, just ChangeMe1#
    iec 61850, 3:12 PM X4:
    iec 61850, 3:15 PM X14: You can try access bypass password with supervisory level also when password cannot be accessed.
    iec 61850, 3:18 PM X4: i cant able to open the software to change
    iec 61850, 3:21 PM X14: Did you try enable supervisory level without software in the IED screen?
    iec 61850, 8:13 PM X4: How much the minimum value of A for the breaker contact résistance hd4?
    iec 61850, 7:24 AM X4 joined using your invite
    iec 61850, 7:24 AM X4: Thank you.
    iec 61850, 7:36 AM – AA 8846 Isra: How can I calculate the distance relay apparent z for 1ph to ground fault using PSSE file?
    iec 61850, 9:31 AM X14: I never found this standard. Did used standard of balance RST for determinated condition.
    iec 61850, 9:33 AM X14: #determine
    iec 61850, 12:09 PM – AA 8846 Isra: Do any one have an excel sheets to calculate the distance settings?
    iec 61850, 1:43 PM X6: R phase 90 a
    Y phase 60 a
    B phase 90 a
    N = ? a
    iec 61850, 4:01 PM X4 “: What about angles?
    iec 61850, 4:10 PM X6: 0,120,240
    iec 61850, 4:31 PM – KK 1234 Mochamad Effendi: You Can Calculate symmetrical component formula..
    iec 61850, 4:41 PM X6: How
    iec 61850, 4:45 PM X4: This message was deleted
    iec 61850, 4:52 PM X6 joined using this group’s invite link
    iec 61850, 8:38 PM – You added kk 1369 Aravind S
    iec 61850, 8:47 PM X6 joined using this group’s invite link
    iec 61850, 10:32 PM X4 “: 30 <150°
    iec 61850, 10:27 AM X4: Hii any one share me document for bus bar caluclation 50ka per one second copper bus bar
    iec 61850, 10:31 AM X5 Chatterjee: It will be based on I^2t , where I is the RMS breaking current ( not Making current capacity , which is higher ).

Busbar bracing will be sized based on Making current capacity Ip( Ip- Ist cycle capacity , or, Making capacity) .

Note – I do not have the formulae handy , as I am travelling now .
iec 61850, 10:36 AM – X8: Can I find the CT ratio with the help of secondary injection
iec 61850, 11:54 AM X6: May I know the calculations details
iec 61850, 12:05 PM X5 Chatterjee: What is meant by 30 <150° ???? iec 61850, 12:02 PM X4 joined using this group’s invite link iec 61850, 12:49 PM X6: 30A 150 degree iec 61850, 3:59 PM X6:
iec 61850, 3:59 PM X6:
iec 61850, 3:59 PM X6: This message was deleted
iec 61850, 4:25 PM X5 Chatterjee: Please tell me one answer –
Motor full load current – 300 Amps
My question is –
1). What will be current setting and how you will set it ?
2). And how will you set dial for current ?
Please explain ?
iec 61850, 4:35 PM X6: What kind of relay do you have ?
iec 61850, 4:35 PM X4: For instance you will set according to (locked rotor current)1.1-1.5 (depends on type of relay) sorry but it’s hard to explain it in english for me, i’m native kazakh and russian, and learned relay protection in russian iec 61850, 4:36 PM X5 Chatterjee: It’s multifunction digital MICOM relays . iec 61850, 4:36 PM X6: Over current setting is 110% that means 330A setting iec 61850, 4:36 PM X11: How to check relay communicate or not iec 61850, 4:36 PM X6: Then super iec 61850, 4:37 PM X6: Keep Isc current is 3full load current that means 900A
iec 61850, 4:38 PM X6: Locker Rotor or blocked rotor setting is 6*full load current that mean 1800A with minimum trip setting like in 150mSec
iec 61850, 4:38 PM X6: E/F keep 30A with IDMT curve base
iec 61850, 4:40 PM X6: Time should be very very minimum
iec 61850, 4:41 PM X4: It’s common value, lrc can be different, you have to clarify, if it’s without any resistors it can be more 6
iec 61850, 4:42 PM X6: If you are move to below 6times Of current you will receive frequent trip from the motor..also we need to study what kind of load on the motor..fluid or hard load..need to be considered..
iec 61850, 4:42 PM X4: Exactly
iec 61850, 4:43 PM X6: Thanks yaani
iec 61850, 4:45 PM X4: Where did you see this rules? I see it first time, could you please send source
iec 61850, 4:46 PM X6: This message was deleted
iec 61850, 4:48 PM X6: By experience yaani
iec 61850, 4:48 PM X6: You need to see what kind of starting method is used. Accordingly you can set highset for the motor.
iec 61850, 4:49 PM X6: But we need to more deep with time..
iec 61850, 4:50 PM X6: Time we need to keep little bit higher then locked rotor
iec 61850, 4:56 PMX6: For blowers starting time will b more
iec 61850, 4:59 PM X4: My opinion, Isc calculated diffently and based on power source, I see calculation like this first time🤷🏻‍♂️
iec 61850, 5:13 PM X6: That’s why I mentioned we need to concentrate with time and upstream settings
iec 61850, 5:30 PM X5 Chatterjee: 1). Please tell me one answer –
Motor full load current – 300 Amps
My question is –
a). What will be the current setting and how you will set it ?
b). And how will you set dial for current ?
Please explain ?

2). In VFD – how will you set the timing of “ Catch the Spinning loads and how you can control that based on type loads ?

3). How will see Fraon in Dissolve gas analysis of transformer Oil ?

4). In Dissolve Gas Analysis –
a), if we get more Hydrogen, then what will be type of transformer fault ?
b). In dissolve gas analysis , what are the gases / chemical we obtain from this analysis ?

5) In GIS , what are the check you do for SF6 gas ?

Gas Density meters , Pressure , SF6 Dew Point & SF6 PPM .

6). What is difference between Low Impedance differential and High Impedance Differential Relays?

7). What are the advantages of high impedance differential relays ? Through stabilizing resistor , it can limit the external fault current .
This relay has got more stability . 8) . How would you detect and handle if there is CT saturation in Low Impedance Relays ? 9). What are the two modes of Generator AVR operation –
a). Voltage control
b). Power Factor Control . 10). How you will migrate from 132 kV in to 220 kV system ? Describe the operation .Sudipta Chatterjee
iec 61850, 5:53 PM X6: There r the interview questions or any exam based question???
iec 61850, 5:54 PM – X10: Can we perform c&df test on PT? not asking aboit CVT.
iec 61850, 6:08 PM X14: This message was deleted
iec 61850, 6:10 PM X14: This message was deleted
iec 61850, 6:16 PM X5 Chatterjee: This is right answer for overload setting , my fiends .
iec 61850, 6:18 PM X14: This message was deleted
iec 61850, 6:19 PM X14: This message was deleted
iec 61850, 6:58 PM X14: Wait, I trying to calculate… 😁🙏
iec 61850, 6:58 PM X6: Anybody are working with E-Plan or have any knowledge about it ?
iec 61850, 6:59 PM X4: Hii this manjunatha i have 7 years experience in eplan
iec 61850, 6:59 PM X4: Tel me sir
iec 61850, 6:59 PM X6: I need some help
Can i dm you !
iec 61850, 6:59 PM X6: ?
iec 61850, 7:00 PM X4: Yes tel me sir
iec 61850, 7:00 PM X4: What help u needed
iec 61850, 7:01 PM X6: I am new to eplan so i want to learn more about E-PLAN
iec 61850, 7:02 PM – KK 1233 BHUVANESH KUMAR left
iec 61850, 7:02 PM X4: U have eplan software
iec 61850, 7:02 PM X6: Yes
iec 61850, 7:03 PM X4: 7829698334 this my no u can WhatsApp or cal me
iec 61850, 7:03 PM X4: When you dout
iec 61850, 7:11 PM X6: Ok
iec 61850, 7:17 PMX13: Hello everyone
I have 4yr experience in solar o&m department. But we want learn etap and solar design. Substation design please any update me about this .
iec 61850, 7:40 PM X5: This message was deleted
iec 61850, 8:39 PM X14: easiest to answer….. 9). What are the two modes of Generator AVR operation –
a). Voltage control. This setting field is used to enter the desired generator output terminal voltage. The AVR setpoint value range depends on the regulator sensing voltage and band setting.
b). Power Factor Control . The PF Setpoint determines the level of generator power factor maintained
iec 61850, 11:07 PM – X10: How to test an anti pumping relay of HV CB?
iec 61850, 12:33 AM X6: If you push the CB ON button(cb should close) and then while the ON button is still pressed push the CB OFF button(or give protection trip) simultaneously then even after spring charge CB will not close. Also when the CB is closed u can see that when CB ON button is pressed, anti-pumping relay will pickup.
iec 61850, 6:19 AM – X10: Got it… Exactly what i wanted to know. Thanks
iec 61850, 7:58 AM X5 Chatterjee: I have got few below questions for which I do not have clear responses.
Would anybody try to help me ?
1). What’s the main function of Pole Discrepancy Relays ?
2). How does Brushless Generator operate without brushes ?
3). In Transformer Gas Analysis , if H2 is more then what’s the type of transformer fault you can think of ?
4). How do u detect CT saturation in Low Impedance Busbar Differential Relays ?
iec 61850, 7:58 AM X5 Chatterjee: Can anyone help me to to get the correct answers ?
iec 61850, 8:05 AM X5: Interested in PSCAD training videos PM Me
iec 61850, 8:15 AM X14: 1). Protect for circuit breaker internal mechanism failure hence the breaker poles will be closed unequally or delayed.
2). Sending voltage to build magnet in main rotor using Dioda rotating after rotor exciter.
3). Corona
4). If a CT has reached saturation, may diffential active alarm.
iec 61850, 8:17 AM X14: Corrected ?
iec 61850, 8:25 AM X14: When CT saturated, then reading will be not linear..
iec 61850, 8:34 AM X5: Dual slope characteristics won’t allow relay to Operate on CT sat.
iec 61850, 9:02 AM X5: Preferably 2nd slope😂
iec 61850, 9:05 AM – You added J 1000 1272 Intru Mr. Imran khan
iec 61850, 9:42 AM X5: 400 kV GIS operating manual?
iec 61850, 9:48 AMX5: PM me
iec 61850, 9:51 AMX5: I will give send u
iec 61850, 9:52 AM X5: Ok my gmail is sharma.jigyesh@gmail.com send me
iec 61850, 9:55 AM X6: Group send all guys help
iec 61850, 9:59 AM X6: 4). What I know about REB500 relay is that it have patent of CT saturation detection. REB500detects CT saturation, then from the distorted(saturated) current it recreate that signal.
iec 61850, 10:18 AM X4: Yes,do Plz send in group,thanks
iec 61850, 10:25 AM X14: Finally, diff alarm will be come…😀
iec 61850, 10:27 AM X14: Number 1 2 3, please your review…
iec 61850, 12:29 PM X2:
iec 61850, 12:29 PM X2: Indian standard
iec 61850, 1:12 PM – X10: 👍🏻
iec 61850, 2:25 PM – +971 58 167 0157 joined using this group’s invite link
iec 61850, 2:26 PM mindia: What should be OLTC AVR relay PT Lower and raise voltage settings.
iec 61850, 2:32 PM X1:
iec 61850, 2:33 PM X5: For phase angle correction
iec 61850, 2:36 PM X1: Sir Only for phase angle or also any function of this
iec 61850, 2:39 PM – X10:
iec 61850, 2:41 PM – kk 1441 Prakash Gunasekaran: Current measuring purpose
iec 61850, 2:43 PM – X10: Yes.. But why not in every CB yatd panel… Its only installed in middle CB panel
iec 61850, 2:57 PM X6: Are u taking it personally?! I though it was a technical discussion. Anyway from my point of view differential alarm will not come at this condition(during saturation) if it is REB500. If it was internal fault it will trip, if external not.
iec 61850, 3:02 PM X6: Although without drawing/ specific picture it could not be answered, to me it looks like matching CT(Interposing CT). Check if the ration of bus CT and tie CT matches or not.

iec 61850, 3:04 PM X10: Ratio are same
iec 61850, 3:04 PM X10: 2000/1
iec 61850, 3:26 PM X6: Then please check drawing……
iec 61850, 3:28 PM X6: 60kv AIS operating manuel and commmissionoing
iec 61850, 3:40 PM X10: Actually we have one and a half breaker scheme in our substation…
iec 61850, 3:40 PM X10: I think installed these ct core in middle Q3 CB panel so that it can share its core with both Q1 and Q2…
iec 61850, 3:54 PM kk 1267 Bouhamida Kamel: Pack plus standard ouvert
iec 61850, 4:14 PM X6: The general purpose for current measurent &protection
iec 61850, 5:57 PM X6: Check furrell and schematics
iec 61850, 5:58 PM X6: If schematics available then do share
iec 61850, 5:58 PM X6: Then we may find its purpose
iec 61850, 6:00 PM X14: This message was deleted
iec 61850, 6:02 PM X6: Why?
iec 61850, 6:03 PM X14: Sorry it is wrong group
iec 61850, 6:03 PM X6: Pls discuss
iec 61850, 6:06 PM X14: this makes the most sense..
iec 61850, 6:07 PM X14: And this may need to be clearly
iec 61850, 6:08 PM X6: The same I was telling without having scheme it’s not possible
iec 61850, 6:10 PM X14: Yes.. Because he asking purpose..
iec 61850, 6:11 PM X6: 👍
iec 61850, 6:36 PM X5 Chatterjee: I have got few below questions for which I do not have clear responses.
Would anybody try to help me ?
1). What’s the main function of Pole Discrepancy Relays ?
2). How does Brushless Generator operate without brushes ?
3). In Transformer Gas Analysis , if H2 is more then what’s the type of transformer fault you can think of ?
4). How do u detect CT saturation in Low Impedance Busbar Differential Relays ?
iec 61850, 6:44 PM X14: You got answer without feedback..
iec 61850, 6:46 PM X5 Chatterjee: Not satisfactory & legitimate response to no.2, no.3 and no.4.
iec 61850, 6:47 PM X5 Chatterjee: Please see if anyone can guide me ?
iec 61850, 6:51 PM X6: Ans1. Pole discrepancy is the difference in operating times bw the 3 phases or poles and these pdrs gives protection the logic to relay for operating if there is any mismatch in any of the three phase.
iec 61850, 6:51 PM X6: Operating times
iec 61850, 6:58 PM X6: As2. Brushless generators make less noise than brushed generators and present a smooth operation. Without electric brushes, there is much less friction when the generator is running. These are easier to maintain than brushed generators with less moving parts to clean, repair or replace. Fewer moving parts also means less wear and tear on the alternator. The absence of brushes eliminates overheating issues and breakdowns as well.While brushless generators may pose a higher cost upfront, they have an extended lifecycle of as much as three to five times longer than traditional brush models.
iec 61850, 7:00 PM X6: Ans.3 For transformer H2 test DGA test is performed. A DGA test will indicate high thermal gases (Methane, Ethane, and Ethylene) as a result of overheating of the liquid. These gases are formed from a breakdown of the liquid caused by heat. Heating may be caused by poor contacts on a tap changer or loose connections on a bushing or a grounding strap.
iec 61850, 7:05 PM X6:
iec 61850, 7:05 PM X6: Ans.4 Adaptive trip logic is adopted for detection of CT saturation in Low Impedance Busbar Differential Relays
iec 61850, 7:07 PM X6: 👆
iec 61850, 7:07 PM X5 Chatterjee: I got this response earlier
But this response is also good .
iec 61850, 7:09 PM X5 Chatterjee: Your analytical response is quite helpful to know the subject .
But question was – only if H2 is of high value , what type of fault you can predict ?
iec 61850, 7:10 PM X4: nice explanation
iec 61850, 7:11 PM X14: Well, complete answer, you will get hired. 👏👏😀
iec 61850, 7:12 PM X5 Chatterjee: This forum is really helpful to all of us in understanding the subject matter .
Many thanks to all participants.
iec 61850, 7:12 PM X6: 😄😄😄
iec 61850, 7:13 PM X6: R u filipino?
iec 61850, 7:14 PM X14: Me? Indonesian..
iec 61850, 7:14 PM X6: No issue you are jolly nature I like ur cool head
iec 61850, 7:14 PM X6: 👍😄
iec 61850, 7:14 PM X5 Chatterjee: I am too old to get hired .
I could understand just now through paper published in internet that if H2 is higher then Arcing fault possibility is always there . Not sure .
iec 61850, 7:15 PM X5 Chatterjee: Thanks to all of you for valuable contribution .
iec 61850, 7:15 PM X6: You are welcome
iec 61850, 7:16 PM X14: Before arcing, corona first..
iec 61850, 7:17 PM X6: Safety comes first…definitely🙂
iec 61850, 7:17 PM X5 Chatterjee: I am an old man on the verge of retirement .
So please do not treat that I am testing you all .
Rather we are discussing to get more clarity on our responses .
iec 61850, 7:19 PM X6: This message was deleted
iec 61850, 7:19 PM X5 Chatterjee: Yes you are right .
Corona first before arcing .
I believe arcing is type of corona discharge for small period of time .
I think Rio have given this response earlier in the morning, but that time I have misunderstood it .
Cheers , man
iec 61850, 7:20 PM X14: Arcing will come when energy potential deffential enough to move electron, when near to enough, not enough, corona showed.
iec 61850, 7:20 PM X5 Chatterjee: Yes you are right
iec 61850, 7:21 PM X14: Number 2, I try answer what the difference working principle.
iec 61850, 7:22 PM X14: Number 4, I make it simple and quickly.🙏😬😁
iec 61850, 7:23 PMX6: One of the type is-There will b a small permanent magnet generator also known as pilot exciter coupled to the main generator shaft and generates a substantial voltage which is fed to AVR. The avr in turn generates dc voltage after taking feedback and supplies dc to the main exciter winding inside which a part of main rotor will be rotating. This induces a voltage inside rotor which is rectified into dc voltage by the help of rotating diodes and fed to main rotor winding thus generating main supply in stator.
iec 61850, 7:24 PM X14: Yes, safety first before corona(cov-19) attack…😅
iec 61850, 7:26 PM X5 Chatterjee: This seems to be more legitimate, which makes sense in line with what we read in text books in college
iec 61850, 7:27 PM X5 Chatterjee: Thanks to everyone for participating with valued inputs .
Pl take care.
iec 61850, 7:27 PMX6: 👍🏻
iec 61850, 7:32 PM – X10: Can anayone share notes or reading material on AC and DC hipot testing? Specifically for CT, anf PT
iec 61850, 7:35 PMX5: Which excitaion system is better for power system stability ??
iec 61850, 7:37 PM X5 Chatterjee: DC hipot is destructive test .
Hence , not recommended.
U may do it as ist time during FAT , not any more .
For cable , Switchgears- we always do VLF test .
iec 61850, 7:38 PMX6: Brushed Systems having series compounding transformers will practically take care of around 60% of load changes inherently even if avr fails….
iec 61850, 7:40 PMX5: My queation is which excitation system better and fast response for power system point of view
iec 61850, 7:40 PMX5: Brushless is also having PSS
iec 61850, 7:42 PM X14: That using permanent magnet
iec 61850, 7:44 PM X14: Because power supply for AVR is isolated, excitation confident
iec 61850, 7:45 PM X2:
iec 61850, 7:45 PM X2:
iec 61850, 7:45 PM X1: 😄😄😄
iec 61850, 7:48 PMX5: Brushless time constant very high bez PMG output used for avr regulation and avr output used for main exciter and then generator rotor field ….But static excitayion system avr output directly connected with generator rotor field…Static excitayion is very fast response than brushless excitation system..
iec 61850, 7:50 PMX6: 👍🏻
iec 61850, 7:51 PMX5: Maintence point of view brushless system better than static excitation system.
iec 61850, 7:59 PM X14: You are second one will get hired my friend..😉👍
iec 61850, 7:59 PMX5: Thanks bro
iec 61850, 8:01 PM X14: We have also generator brushless without PMG, I thing this is second of quality excitation
iec 61850, 8:02 PMX5: http://www.slideshare.net/DeepakJha4/static-excitationsystem?from_m_app=android
iec 61850, 8:02 PMX5: Brushless With out PMG🤔🤔🤔🤔🤔
iec 61850, 8:08 PM X14: Self Excited generator
iec 61850, 7:28 AMX6: What we have to check if transformer tripped in 1. HV REF 2. LV REF 3. Differential Protection iec 61850, 7:33 AMX5: Total Tx test, dga oil test, bdv test….
iec 61850, 7:34 AMX5: Kindly to be noted that the above tripping along with what are the other protection optd ????
iec 61850, 7:36 AMX6: O/C & E/F WTI,OTI,PRV
iec 61850, 9:40 AM X4: HV REF means an earth fault between your HV CTs, through HV winding to the neutral CT. Do physical inspection for any obvious fault. If not found, reset and energize. If it trips again,it could be maybe a failed surge arrestor or transformer winding. Test the surge arrested. If ok, test HV winding.
For LV REF, repeat the above but on the LV side of the transformer.
For differential protection it could be any fault between the HV and LV CTs.
iec 61850, 9:54 AM X6: Can someone send me any link where I can learn how to do testing of vacuum circuit breaker,revac,control panel etc.
iec 61850, 9:55 AM X1: Check your protection scheme, it could be swapping of CT polarity
iec 61850, 10:05 AM X5 Chatterjee: Very good fault finding techniques .
Keep it up 👍.
1). CT polarity shall be the ist check for differential.
2). For HV REF & LV REF , please check the connection integrity as explained above ( relay shall be connected between 3 line CTs & one Neutral CT ) . There may be wrong connection and wrong CT polarity .
iec 61850, 10:07 AM X5 : Have you checked Stability and Sensitivity for Differential and HV & KV REF ?
iec 61850, 10:07 AM X5 : Please let us know what are your findings based on above ?
iec 61850, 10:09 AM X5 : Easiest way – to create a fault within the CT regions , if it trips – then differential & REF Protections are fine .
iec 61850, 10:12 AM X4: Not only inzone, scheme shall be stable enough for out zone fault. Stability of scheme is also important
iec 61850, 10:12 AMX6: Thanks for Guidance
iec 61850, 10:13 AMX6: Thanks for Guidance
iec 61850, 10:17 AM X6: TR differential could be connected by post CT(Overall diff), or Bushing CT. Please check the scheme, if both operated, It’s internal fault. I’m not a big fan of IR test, but simply this IR test sometime can confirm it. Tan-delta could also be done.
iec 61850, 10:38 AM X5 Chatterjee: Ankit ,
Very logical way of finding faults .
Please check this as explained.
iec 61850, 10:38 AM X6: Yes, there are Brushless system, where supply is given from battery bank.
iec 61850, 11:00 AM X5: I hope you’re having a great week.
I’m currently searching for a new opportunity in relay commissioning field and I have completed my one year apprenticeship program in relay testing and commissioning field in KSEB Pvt Ltd ,India.I’d love if you could let me know if you hear of any opportunities that you think I’d be a good fit for.
Don’t hesitate to let me know if you have any questions.Best regards Nisham
www.XXXXXXXXXXXXXXXX
iec 61850, 11:16 AM X6joined using this group’s invite link
iec 61850, 11:22 AM X6: Any self protection operated?! If not, >90%chance of being external/false triggering.
iec 61850, 11:50 AM : Can anyone explain that in one and half breaker scheme each circuit of a double circuit transmission line are terminated in different diameters. Why?
Thanks
iec 61850, 12:13 PM X5 Chatterjee: Ankit ,
Please check REF for through fault ( as it should not trip on external fault ). REF should trip only during Faults only within the 3 Line CTs and one Neutral CT .
It should not trip in external faults .
Please check the relay settings .
iec 61850, 12:15 PM X5 Chatterjee: Asif ,
It is surprising that transmission lines of different diameter .No clue .Please check .Since 2002, I am working overseas.
In India , I have never worked in one and half breaker scheme .
In KSA and uk – I have not come across this different diameters .
iec 61850, 12:24 PM X5 Chatterjee: Thanks for the updates .
I need to see CEA guidelines.

IEC 61850, 8:19 PMX5: Correct sir but back up trip to upstream bkr only
IEC 61850, 8:24 XX: But why Transformer Neutral Earth Fault (64 N ) not for as back up for downstream incomers ?
IEC 61850, 8:24 XX: Please explain
IEC 61850, 8:25 XX: Yes , I agree with you that always upstream HV breaker will tripped ist to prevent the fault back up .Yes you are correct .
IEC 61850, 8:27 X5: Sir ref only protect define zone of both CT phase side and neutral ..Back earth fault not define any zone
IEC 61850, 8:28 XX: It’s a percentage zone Earth fault protection of the transformer windings only .
IEC 61850, 8:29 XX: Yes back up fault does not define any zone .
IEC 61850, 8:30 XX: It’s a very good & valid technical response from you .
Appreciate your thought process .Cheers
IEC 61850, 8:34 X5: How many limiters used in AVR system
IEC 61850, 8:34 X5: ????
IEC 61850, 8:35 X5: Which first operated avr limiters or protection system ????
IEC 61850, 9:02 XX: Erath fault relay is always connected on LV side of Transformer?
IEC 61850, 9:03 XX : Yes , correct
IEC 61850, 9:03 XX: 👍🏻
IEC 61850, 9:04 XX: Also REF is connected to HV side?
IEC 61850, 9:04 X5: No star side of tx
IEC 61850, 9:05 XX: Yes.. We have a auto transformer whose HV side is Y type and REF rely is installed on it
IEC 61850, 9:06 X5: You should clear mention bro
IEC 61850, 9:08 PM X5: REF is used to compare the Io current from HV Phase CT with REF CT on HV CT Neutral Transformer
IEC 61850, 9:09 XX: Yes my friends , in DY Transformer,
50 N in Transformer LV side Neutral while Neutral is solidly earthed / Resistance Earthed .
If it is Unearhed System like in FPSO and Drilling Vessel 🚢, then Benders Earth Fault detection is used .
If Earth Fault current is limited to very low value , then CBCT operates Sensitive Protection is implemented .
IEC 61850, 9:12 PM X6: 👍👍👍👍👍👍👍👍👍
IEC 61850, 9:12 XX: Have anyone worked on tertiary busbar relays?
IEC 61850, 9:15 XX:
IEC 61850, 9:16 XX: Is above scheme of ct cck implement for tertiary Erath fault relay is correct… For 600MVA auto transformer with tertiary busbar
IEC 61850, 9:17 X5: Wrong diagram
IEC 61850, 9:18 X5: Double earthing not allowed
IEC 61850, 9:19 XX: Can we use 3 CT for tertiary earth fault relay
IEC 61850, 9:19 XX: I have heard only two CTs are needed… RED AND YELLOW
IEC 61850, 9:26 X1: Well explained thanks ….we call that protection as standby earth fault 51SBEF.
IEC 61850, 9:29 XX: Seperate neutral earth fault relay will give backup to entire downstream network. Whereas REF will operate only for in zone fault. That is why it known as “restricted earth fault” protection.
IEC 61850, 9:30 XX: 👍🏻
IEC 61850, 9:38 X9: 👍
IEC 61850, 9:39 XX: There is no double earthing bro
IEC 61850, 9:39 X9: Right…your current must be flow through relay coil…you r right
IEC 61850, 9:40 XX: CTs are being summed in MCC panel i.e star point
IEC 61850, 9:40 X9: Got it buddy
IEC 61850, 9:40 X6: Okay
IEC 61850, 9:41 X6: Why we used resistor and mitrosil in ref
IEC 61850, 9:42 XX: This scheme is implemented in our substation and the relay is always showing high neutral current….
IEC 61850, 9:44 XX: I was wondering if there is some error in this scheme
IEC 61850, 9:44 XX: Resistors are used so that REF does not trip during though fault current .
Metrosils are used as Surge Suppression
IEC 61850, 10:07 X9: to add high impedance in Circuit to proper operation of REF
IEC 61850, 10:13 XX: Why do have extrrnal busbar in auto transformers in case of tertiary winding?
IEC 61850, 10:37 XX: My only one question-
No clue about the below issue –
We are using Low Impedance Busbar Protection Relays .
*How to detect the CT saturation in case of this low impedance relays *?
Can anyone help me to get the right answer ?
IEC 61850, 6:31 X4: My humble suggestion is: You may find the solution in that particular low impedance relay’s manual in application or operation section, it is possible that they would have mentioned about it in that section
IEC 61850, 6:57 X5 Chatterjee: Could not find it
IEC 61850, 8:17 X6: Which vendor?
IEC 61850, 8:20 X1: Dear all,
Gud mrng actually i faced one issue in my site, when i switch on the MCB’s Trip coil suddenly melted..i need to route the cause..can any one tell me what are all the possibilities of trip coil damage.
IEC 61850, 8:25 X1: There is permanent DC to the coil either the wiring is not passed through normally open contact of the CB pilot switch or it’s from a wrong wiring
IEC 61850, 8:30 X1: How to find out these issues?
May i share the scheme can you please aasit me how to verify this conditions?
IEC 61850, 8:31 XX:
IEC 61850, 8:31 XX: Yes y not
IEC 61850, 8:32 XX: Thankyou
IEC 61850, 8:42 XX: First of all you have to ensure that the Signal is not from control room
IEC 61850, 8:43 XX: Still not energised.
IEC 61850, 9:20 AM X6: I guess the wiring is wrong…. U have connected CB NC to trip coil, it should be NO contact. So when the breaker is open, you Switched the MCB on, there was(maybe) trip signal from anywhere, trip coil energised, but the CB is already open…. It was energised untill burned…
IEC 61850, 9:22 AM X6:
IEC 61850, 9:25 XX: Yes you right
IEC 61850, 9:26 XX: And what is the function of U1/205
IEC 61850, 9:29 XX: Okay my suggestion is to swap the wire on the CB NO with the one on the CB NC
IEC 61850, 9:30 XX: I believe it will solve the problem
IEC 61850, 9:31 XX: U1/205 is TCS relay
IEC 61850, 9:41 XX: Yes sir but i verified no trip signal and there was no loop. So how trip signal gone to trip coil.?
IEC 61850, 9:43 XX: Which means u1 – 18 should be in c5 and 23 should be in A3 am i right?
IEC 61850, 9:43XXX:
IEC 61850, 9:50 XX1: Thanks for sharing 👍
IEC 61850, 9:56 XX: Kindly confirm that sir @2348034462828
IEC 61850, 9:57 AM X6: Thank you for scharing
IEC 61850, 10:02 XX: 👍🏻👍🏻
IEC 61850, 11:02 XX: Yes confirm
IEC 61850, 12:13 XX: Thanks 😊
IEC 61850, 4:45 PM X14:
IEC 61850, 5:01 XX:
IEC 61850, 5:11 XX: Saturation of current transformers (CTs) can lead to maloperation of protective relays. Using the waveshape differences between the distorted and undistorted sections of fault current, this paper introduces a novel method to quickly detect CT saturation. First, a symmetrical variable-length window is defined for the current waveform. The least error squares technique is employed to process the current inside this window and make two estimations for the current samples exactly before and after the window. CT saturation can be identified based on the difference between these two estimations. The accurate performance of this method is independent of the CT parameters, such as CT remanence and its magnetization curve. Moreover, the proposed method is not influenced by the fault current characteristics, noise, etc., since it is based on the significant differences between the distorted and undistorted fault currents. Extensive simulation studies were performed using PSCAD/EMTDC software and the fast and reliable response of the proposed method for various conditions, including very fast and mild saturation events, was demonstrated.
IEC 61850, 5:18 PM X5: Check my IEEE paper on this
IEC 61850, 7:29 PM – kk 1641 silas bizimungu:
IEC 61850, 8:55 PM – kk 1641 silas bizimungu: got an answer from ABB website
IEC 61850, 11:27 PM X1: Please can I have more clear pictures so that I can confirm the right connections
IEC 61850, 6:14 XX: Okay sir i ll send you
IEC 61850, 9:33 AM X5 Chatterjee: I could not have access to your paper . Can you please forward me your IEEE paper to my email address
chat_sudipto@yahoo.co.in
IEC 61850, 9:34 AM X5 Chatterjee: It’s a very interesting topic .
We face this CT saturation at sites
IEC 61850, 9:53 AM X5: Yes sure
IEC 61850, 11:18 XX4: Allso for me email = khme7783@gmail.com
IEC 61850, 12:29 PM X1: 1. In the case of 4 CT method (1 No 5 Core CT in line, 2 Nos of 5 Core CT in tie and 1 No of 5 Core CT in AT feeder). Now if I do not use the 4 CT method then a fault between CB and CT (End fault) may still then be fed from one side even when CB has been opened. Consequently, final fault clearing by cascaded tripping has to be accepted in this case. In this situation LBB/BFR operates and time taken to clear the fault is 300 mSec. This is blind zone area.

  1. When the fault takes place between the main CB, Tie CB & line isolator in service condition distance scheme takes care in addition this TEED protection is not available.
    Now my doubt is about blind zone area.
    # I think the 4 CT method should cover all the line, tie and AT CB blind zone area but actually it’s not. It covers only the tie CB blind zone area. Why?
    # If presently I am constructing only a line and tie bay with AT bay in future. 4 CT method is adopted. Considering that AT bay is in future so can I consider the 4th CT of tie bay in future?
    IEC 61850, 1:57 PM X6: First of all please note its my Personal opinion, experts may give better feedback.
  2. End fault zone will be there, if u dont have a Tee zone(Whether it is local end/remote end). If u enable end fault protection, it’ll take less time(with respect to BFP).

Considering AT as future bay, only two bus CT could be used/enough to me.
IEC 61850, 3:12 X4: Hello friends. When testing line differential protection (I’m using General Electric’s L90 relay), where do i configure in enervista so as to test the relay as a stand alone (i dont have the remote relay/current)
IEC 61850, 3:14 XXXX: hi bro, could you share the study with the adjustments?
IEC 61850, 3:15 XXXXX: In LINE DIFF There is option for test mode or internal in relay as I remember just see the line differential settings and you can find it there in enervista
IEC 61850, 3:20 XX:
IEC 61850, 3:23 XXXXX: Can u send the left picture full it is there in test mode try to open every + u will see
IEC 61850, 3:23 XXXXX: In group 1
IEC 61850, 3:25 XXXXX: This message was deleted
IEC 61850, 3:27 XXXXX: Go to testing Tab and then test mode
IEC 61850, 3:27 XXXXX: As remembered
IEC 61850, 3:32 XX:
IEC 61850, 3:32 XX: I have expanded everything under group 1. No test tab
IEC 61850, 3:32 XXXXX: Below input output there is testing tab
IEC 61850, 3:33 XXXXX: Please have a look at the end of the group’s
IEC 61850, 3:33 XXXXX: Can you share that picture
IEC 61850, 3:34 XX:
IEC 61850, 3:36 XXXXX:
IEC 61850, 3:38 XXXXX: I am not sure why you are not getting it can you please have a look
IEC 61850, 3:39 XX: I’m in the offline window. Maybe that is the reason. Later i will try to go online and see if i will have the test tab.
IEC 61850, 3:40 XXXXX: Yes that might be the reason and you can make it
Elesrwise take fibre with u just make loop back on back side of relay and you can test your diff with external mode on as per actual
IEC 61850, 3:41 XXXXX: Fibre connect on back side of relay as a loop just like wire jumper
One end of fibre on Rx and other end on Tx
IEC 61850, 3:45 XX: I will try both ways. Thank you alot. This was insightful.
IEC 61850, 3:46 XXXXX: Thanks 👍
IEC 61850, 7:22 X2: Dear all gud eve.
IEC 61850, 7:22 X2: May i know what is IPCT and what is the purpose of this IPCT?
IEC 61850, 7:22 X2: Can anyone explain me please?
IEC 61850, 7:27 XX: Never used it .
IEC 61850, 7:28 XX: This is google answer –
The IPCT is a High Sensitivity Current sensor operating as a “closed-loop” Direct Current Transducer (DCCT) operating with a flux-gate zero-flux detector.
IEC 61850, 7:30 X2: 😊hmm
IEC 61850, 7:31 X2: Okay thankyou🤝
IEC 61850, 7:32 X2: Actually in our site they installed IPCT to Main CT primary and they have given IPCT secondary to relay input. So i want clear explaination from this group. Dear all if you know well kindly share us. So we will get some idea about it.
IEC 61850, 7:47 XX: Question- how will you test Stability and Sensitivity Test for Line Differential relay at Site ?
Is it the same way we test Transformer Differential?
IEC 61850, 7:49 X2:
IEC 61850, 7:50 X2:
IEC 61850, 7:50 X2: Are u talking about interposing CT? But its used in secondary cercuit of CT change/match CT ratio with references…
IEC 61850, 7:50 X2: we have thses CT cores in middle CB panel for metering purpose… can anayone explain the reason behind it?
IEC 61850, 7:51 X2: this is the schematic of installed CTs
IEC 61850, 7:52 X2: Can u share the nameplate of that interposing CT?
IEC 61850, 7:53 X2: Smaller ones in the Pic?
IEC 61850, 7:53 X2: Yes
IEC 61850, 7:53 X2: Unfortunately I don’t have it…
IEC 61850, 7:54 X2: Maybe ur meter is of 5A(a possibility)…..
IEC 61850, 7:54 X2: are these interposing CTs?
IEC 61850, 7:54 X2: Yes
IEC 61850, 7:54 X2: Yes
IEC 61850, 7:55 X2: Okay wait
IEC 61850, 7:56 X2: Sorry unfortunately i dont have now
IEC 61850, 7:56 X2: Sure i share tomorrow.
IEC 61850, 7:57 X2: Dont we use interposing CTs for relays? i have never heard them used for metering purpose
IEC 61850, 7:59 X2: Sorry i can’t understand. If you dont mind tell me again clearly please.
IEC 61850, 8:00 X2: In the schematic given, these CTs are used for metering purpose
IEC 61850, 8:03 XX: We used to use Interposing CTs in earlier non-digital Relays for Transformer- Differential .
Apllication- *It is used in secondary circuit of CT connection in Star / Delta matching with other CT with references… in case of various applications like transformer differential. *
This interposing CTs is very popular connection for Transformer differential.
IEC 61850, 8:05 X2: In motor feeder also some times they are using ICT. Can you explain why ICT is being used for motor feeder..??
IEC 61850, 8:06 X2: Mostly used in Transformer differential, but also used in other purposes. I’ve seen it in busbar differential (static type), even in meter circuit, converting protection core to metering.
IEC 61850, 8:07 PM – +57 350 8428171 left
IEC 61850, 8:07 X2: but all our relays are digital
IEC 61850, 8:08 X2:
IEC 61850, 8:08 X2: I think if you tell us the ICT’s spec and meter’s ampere rating, it will be easy to answer.
IEC 61850, 8:09 X2: ICT name Plate details
IEC 61850, 8:10 XX: Mind that – These are called ICT ( not IPCT ) .
IEC 61850, 8:31 X2: Primary 1A , Secondary 1A , VA burden 0.4VA
IEC 61850, 8:31 X2: I have got it…
IEC 61850, 8:32 X2: These CTs are used for isolation purpose… and are installed between CT secondary and Energy meter…To protect our energy meter from any mishape in secondary cct
IEC 61850, 8:32 X2: just like opto-coupler
IEC 61850, 9:24 X2: Then maybe the CT VA was too high then connected burden. Normally only for isolating purpose this type of scheme… I’ve not seen. Rare than.
IEC 61850, 9:25 X2: Main CT burden is 30VA and isolating CT burden is 0.4VA…quite a difference
IEC 61850, 9:26 X2: No, i think its not like that….
The ICT’s burden is 0.4VA.
IEC 61850, 9:27 X2: Yeah…. ICT burdeis 0.4VA
IEC 61850, 9:27 X2: You have to measure the knee point voltage of that ICT. It should be lower.
IEC 61850, 9:28 X2: Lower than 0.4VA?
IEC 61850, 9:30 X2: Actually the reason(to me) to use ICT is that the CT VA is too high then the connected VA(May be >10 times). So, although the FS <6, meter may take upto 60times current. So ICT ia used which have low knee point voltage. IEC 61850, 9:35 X2: Is it a bad thing if connected energy meter burden is less than main CT burden? IEC 61850, 9:37 X2: To me, it’s not a big matter of concern. Now-a-days meter can take 100A current for a while. And we have protection redundancy to trip quickly….. IEC 61850, 9:37 X2: It means ICT is used to lower the VA burden so that energy meter does not draw high current? IEC 61850, 9:37 X2: 👍🏻 IEC 61850, 9:38 X2: Thanks IEC 61850, 9:38 X2: welcome…. 🙂🙂 IEC 61850, 10:08 X2: Thanks IEC 61850, 2:42 X8: Anyone have EMCO AVR relay service engineer contact no in india IEC 61850, 6:04 X8: How to calculate transmission line loss from line length IEC 61850, 6:41 X9: Hey guys How we can calculate circulating current between two parallel transformers IEC 61850, 6:41 X9: I mean measureing that current?! IEC 61850, 11:36 XX: Hello guys Could you please send me file of IEEE 43 IEC 61850, 6:00 X7: Hi any one give me suggestion.. In one of the project customer is asked meter accuracy is 0.5 and ct accuracy is class is it k… Also suggest me.. How to loop in and loop out siemens pac3200 meter eathernet port becuse. It is having only ine port IEC 61850, 10:45 AM X5: How to block power sing in a distance relay? IEC 61850, 10:56 X9:
IEC 61850, 10:57 X9: 4 times of Iset
IEC 61850, 11:21 X7: Sen your xrio file please
IEC 61850, 11:21 X7: It will be faster
IEC 61850, 11:21 X7: Send*
IEC 61850, 11:31 XX: Can anyone clarify:
We have a 400kV bus reactor which has primary protection as differential, REF, O/C and backup impedance protection. During switching the instantaneous backup impedance protection operates and causes trip.

  1. Can we add some intentional time delay in backup impedance protection? If yes how much?
  2. How much percentage does the backup impedance protection cover and how many stages?
    IEC 61850, 11:32 XX: What is ypu earthfault highset setting?
    IEC 61850, 11:52 X9: 40%
    IEC 61850, 11:54 XX: This message was deleted
    IEC 61850, 6:20 X2: Yes you can increase but may I know what is the previous setting?
    IEC 61850, 6:32 PMX5: Back up impedance setting should not beyond LBB tripping time delay… That should ensure
    IEC 61850, 6:33 PMX5: Kindly update here back up impedance which method adopted in protection relay???
    IEC 61850, 6:34 PMX5: Voltage controlled overcurrent????
    IEC 61850, 7:02 X2: Why you are related with LBB?
    IEC 61850, 7:04 PMX5: Reduce feeding fault cycle bro
    IEC 61850, 7:09 X2: Not understood
    IEC 61850, 7:09 X2: What about LBB setting it’s little bit higher then normal setting..
    IEC 61850, 7:10 X2: But both protections are totally different
    IEC 61850, 7:10 PMX5: Agree but you can not feed fault too long
    IEC 61850, 7:57 X2: Current setting is backup impedance is zone -1 50% instantaneous and zone -2 66% time delay 0.5 seconds
    IEC 61850, 7:57 X2: It’s voltage based oc
    IEC 61850, 7:58 X2: My question was can we give delay and how much. How much zone percentage backup impedance should cover and how many stages
    IEC 61850, 8:47 PMX5: But you here mentioned zone setting???
    IEC 61850, 8:48 PMX5: Which one is correct???
    IEC 61850, 9:32 X2: Current setting I meant present setting
    IEC 61850, 10:00 X8:
    IEC 61850, 10:02 AM X6: English please
    IEC 61850, 10:02 X8: Oh sorry
    IEC 61850, 10:34 AM X5 Chatterjee: https://www.helioselectric.net/blog/how-to-maximize-substation-reliability-at-a-lower-cost-using-a-breaker-and-half-scheme
    IEC 61850, 10:56 AM X6: Do anyone knows what will be the minimum drop off voltage for the switch disconnector fuse, of Schneider make NX032 model.?

IEC 61850, 11:05 AM – kk 1237 Sambhaji Kate: Measure contact resistance and then maximum current x resistance
IEC 61850, 11:41 XXX50: How to test power swing manually.?
IEC 61850, 12:31 PM – kk 1452 Shrawan Shiwarkar joined using this group’s invite link
IEC 61850, 1:49 X2:
IEC 61850, 2:24 PM – kk 1451 Mehdi Mohammadi: What relay test device do you use?
IEC 61850, 2:24 X2: My relay is blocking on both 2nd and 5th harmonics simultaneously
IEC 61850, 2:25 X2: Megger smrt46d
IEC 61850, 2:25 X2:
IEC 61850, 2:30 X2: Setting for 5th harmonics is 35%
10/10/20, 5:21 X8:
10/10/20, 5:23 X8: In EMCO AVR relay at the parallel of PT supply component used which is burnt is capacitor or resistor
IEC 61850, 7:54 XX80: How to hipot test for HT cable.
IEC 61850, 8:00 X7: I too needed,Plz anyone tell ..Thanks
IEC 61850, 8:02 XX8: Please adopt VLF test , which is non destructive test .
hipot is not approved , as it is destructive test .
IEC 61850, 8:02 XX8: Please see the procedures through google .
IEC 61850, 8:29 X7: IEEE 400.2 FOR VLF at of 0.1 Hz frequency
IEC 61850, 8:30 XX80: Deff b/w hipot and VLF test..
IEC 61850, 8:31 X7: Hipot pure Dc test and VLF ac test with 0.1Hz frequency
IEC 61850, 8:32 XX80: Please provide pdf of both test
IEC 61850, 8:32 XX80: But we use also hipot for ac cable
IEC 61850, 8:33 X7: I said hipot is Dc supply
IEC 61850, 8:33 X7: cable can be ac or dc
IEC 61850, 8:36 XX80: How much voltage percentage applied for ac cableb test sir
IEC 61850, 8:37 XX80: Why we two phases short in hipot test
IEC 61850, 9:00 X7: For hipot 2 x rated voltage
For VLF 1.1 x rated voltage
IEC 61850, 9:01 X7: As per normal HV test
IEC 61850, 9:42 AM – kk 1293 Asad ul Rahman: when hipot & VLF test are conducted?
IEC 61850, 9:51 X7: VLF ?
IEC 61850, 9:53 AM – kk 1352 Vigneshwaran Rajendran:
IEC 61850, 9:56 X7: For manufacturing hipot and for diagnostic purpose VLF test conducted
IEC 61850, 9:57 XX80: Please explain about MF of meter How much PF then CT ratio- 125/5A PT ratio-11000/110
IEC 61850, 11:07 X7: Thanks so much dear vicky🙏🏻🙏🏻
IEC 61850, 11:12 XX80: Please visit on IEEE site .
IEC 61850, 11:17 X7: Anyone Kindly send some document for IEC61850 protocol in detail
IEC 61850, 11:22 XX8:
IEC 61850, 11:23 XX8: How to test current reversal and power swing in p546 micom
IEC 61850, 11:23 AM Ammad bahi :p
IEC 61850, 11:28 XX8: Kyun
IEC 61850, 11:28 XX8: Is main bhi koi masla ha Musa
IEC 61850, 12:10 XXX4: Yessssssssss😋
IEC 61850, 12:11 PM – kk 1331 Omar Farouk Berbagui:
IEC 61850, 12:11 PM – kk 1331 Omar Farouk Berbagui: How connect this terminal
IEC 61850, 12:14 PM X5: Its for CT and VT ?
IEC 61850, 12:14 PM X5: You can download the manual book, and search for the wiring diagram of its CT connection terminal
IEC 61850, 12:15 PM – kk 1331 Omar Farouk Berbagui: But there is tow screw in the terminal
IEC 61850, 12:16 PM X5: Does It block your wire ?
IEC 61850, 12:17 PM – kk 1331 Omar Farouk Berbagui: The first screw block the wire the second i don’t know
IEC 61850, 12:24 X5: https://electrical-engineering-portal.com/download-center/books-and-guides/power-substations/contact-currents-400-kv
IEC 61850, 12:26 XX8: It’s for CT
IEC 61850, 12:27 XX8: just open the screw and enter wire on right side
IEC 61850, 12:27 XX8: U can used either side
IEC 61850, 12:37 XX8: Just go through connection diagram
IEC 61850, 12:38 XX8:
IEC 61850, 3:16 XX6: This message was deleted
IEC 61850, 3:17 XX6: Only For indian
IEC 61850, 3:18 PM – Neha Prajapti: thanks for sharing🤗
IEC 61850, 5:02 X2: After installation micom s1 agile 2.0.2 p50 configurator is not showing
IEC 61850, 5:03 X2: Anybody know what is the issue
IEC 61850, 6:34 XX: 2.0.2 r 2.0.1
IEC 61850, 6:34 XX: P50 agile available in 2.0.1
IEC 61850, 6:34 X2: 2.0.2
IEC 61850, 6:34 X2: Please share if available i have 2.0.2
IEC 61850, 7:49 X2: anyone have testing procedure of ISKRA energy meters?
IEC 61850, 9:42 XXX5: https://youtu.be/6KpNGbAwQuc
IEC 61850, 9:50 XXX5: Hi all where we can change the dead and for Siemens relay
IEC 61850, 9:50 XXX5: For analogue values
IEC 61850, 10:24 XXX5: Any one know
IEC 61850, 10:29 X7: Please clarify your question?
IEC 61850, 10:31 XXX5: For analogue signal in DNP3 PROTOCOL AND DIGDI 4
IEC 61850, 10:32 XXX5: Need to change the dead and for analogue signal like current and voltage
IEC 61850, 11:15 XXX5: Deadband
IEC 61850, 11:24 XXX9: Why the diffierantial relay will operated due to inrush current?
IEC 61850, 11:28 XX8: This message was deleted
IEC 61850, 11:28 XX8: This message was deleted
IEC 61850, 11:31 XX8: Current entering in to CT- Zone and current leaving from the CT-Zone ( through the location of two CTs across the Transformer) will be different due to this transformer magnetic inrush during charging of Transformer.
There was always a second harmonic blocking ( magnetic inrush) available in earlier non- digital relays.
And in modern multifunction digital relays we always use the adequate offset for this .

IEC 61850, 12:06 VVV2: Thanks
IEC 61850, 12:36 PMX5: Sir numerical relay also have blocking future when if relay detect 2nd harmonics & 5th harmonics current
IEC 61850, 12:39 PMX5: Normally set 20% 2nd & 5th harmonics. It may be set depend on tx
IEC 61850, 1:01 PM X5: When you energize a transformer there is current in primary winding….and No current in secondary winding…
Hence there is always a differential current present.
But relay has to differentiate between inrush & internal fault . i.e done by so many methods . But generally accepted method is I2/I1
Ratio of second harmonic & fundamental current. If greater than 20 percentage than its a inrush.
Also active power consumed during inrush is very very small…. As compared during internal fault.😃
IEC 61850, 2:00 XX:
IEC 61850, 2:20 XX: Yes , more precisely if I2/I1 (I.e . ratio of second harmonic and fundamental current ) is more than some percentage, then it’s a magnetic inrush.
The limit of magnetic inrush depends on the transformer core design and it’s another big subject .
Offsets for magnetic inrush, Tap-changing, CT error – it’s experimented that if we make an offsets with 20 percent , then it’s quite pragmatic .
IEC 61850, 2:22 XX: Transformer flux density and physical design of the core & windings determine the limit of magnetic inrush .
IEC 61850, 2:25 VVV2: 👍🏻👍🏻👍🏻 Thanks
IEC 61850, 2:42 PM X5: Apart from that On what value of voltage wave the breaker is closed is more predominant towards magnetic inrush….
At zero it’s high & at peak its low…
IEC 61850, 2:42 X2: It also depends upon instant of switching/energization transformer. If transformer switching is done on negative or positive maximum of voltage wave then inrush will be minimum. If transformer is switched when voltage wave crosses zero then inrush will be maximum. Controled switching device can be used to ensure this.
Thanks
IEC 61850, 2:46 PM X5: Exactly 👍🏻👍🏻
IEC 61850, 2:47 PM X5: But how you will help with control switching in 33 kV system….since all breaker pole closes in tandem…..is not possible….
IEC 61850, 2:51 XX: At site , even trained operation guys shall never bother to carry out the control switching.
Hence , this is more theoretical rather than being pragmatic.I may be wrong .
This is based on my 30 years of experience with various sites, even during operation & maintenance.
IEC 61850, 2:52 PM X5: It’s practical on 400 kV I personally worked on it. It’s also called point on wave switching.
IEC 61850, 3:10 X2: Yes we have used PoW or CSD (you can call both name) for 765 & 400 kV
IEC 61850, 3:11 X2:
IEC 61850, 3:11 PM X5: Mr chatterjee
IEC 61850, 3:11 X2: 👆🏻Just if anyone’s interested in voltage switching and inrush relationship theoretically derived
IEC 61850, 3:13 PM X5: Very true. . WD Stevenson… Power system analysis
IEC 61850, 3:15 X2: Yes right
IEC 61850, 3:16 PM X5: Advice : don’t leave your books….else concept will leave you one day 😂
IEC 61850, 3:16 PM – Ridouan HIJE:
IEC 61850, 4:02 X2: See above L1,L2,L3 these are the transformer phases R,Y,B coming for the phase measurement for LCC
IEC 61850, 4:03 X2: So these are used to measure current of these L1,L2,L3
IEC 61850, 4:04 X2: B061+S01 breaker and LCC combined
IEC 61850, 4:05 X2: Metering and Measurement
IEC 61850, 4:05 X2: Li L2 and L3 are middle CB current transformer corea
IEC 61850, 4:05 X2: Cores *
IEC 61850, 4:06 X2: I have figure this out
IEC 61850, 4:07 X2: Thses highlighted CTs are for isolation purpose. To protect the energy meters from any mishap in CT secondary ckt
IEC 61850, 4:07 X2: Figure out first X611.1 have any connection furthur update the drawing check this point
IEC 61850, 4:08 X2: If there is not any joint it means these Cats are just for measurement of L1L2L3
IEC 61850, 4:09 X2: This is summary of scheme
IEC 61850, 4:09 X2:
IEC 61850, 4:10 X2:
IEC 61850, 4:11 X2: Maybe it’s for current summation purpose of all CBs
IEC 61850, 4:15 X2: Follow this
IEC 61850, 4:15 X2: Measuring current
IEC 61850, 4:16 X2: Only
IEC 61850, 4:16 X2: Metering
IEC 61850, 4:17 X2: X611 point leads to metering panel
IEC 61850, 4:17 X2: Where energy meter are installed
IEC 61850, 4:18 X2: Sure, if it’s so what i was telling
IEC 61850, 4:19 X2: Whats the purpose of using these same ratio CTs?
IEC 61850, 4:21 X2: Check DWG for B061+S1 and B062+S2 dwg
IEC 61850, 4:21 X2: I think you will be clear
IEC 61850, 4:28 X2: 👍🏻
IEC 61850, 4:30 XX: It’s easy to understand in transformer action and very much possible to implement coordinated switching in a EHV substation & networks .
But it’s quite difficult to implement based on my experience in big refinery and process plants .
However , it’s a good food for thought to implement this coordinated switching in any big transformer switching to reduce the inrush currents .
Thanks for this input .
IEC 61850, 4:31 X2: What’s purpose you find ?
IEC 61850, 4:37 X2: I have checked all DWG… And I have shared the scheme summary… I think it’s for protection of energy meter from any mishap in Main CT Circuit.. Just like an isolation transformer
IEC 61850, 4:37 X2: VA burden of these small CTs are very less than main CT VA burden.
IEC 61850, 4:38 X2: Maybe it’s for reduction of VA burden
IEC 61850, 4:38 X2:
IEC 61850, 4:41 X2: Yes for metering protection as well as transformer line differential protection
IEC 61850, 6:07 XX
IEC 61850, 8:09 PM -Mohsin”:
IEC 61850, 8:10 PM X5: Please don’t bring College questions here
IEC 61850, 8:11 PM – Mohsin”: College is introduction to knowledge. learning is life long.
IEC 61850, 8:12 XX: Option c..
IEC 61850, 8:12 PM – Mohsin”: Thnx appreciate ur response, but Need basis for your answer.
IEC 61850, 8:14 XX: Okay,there is a small formula for it,I don’t remember bit
IEC 61850, 8:23 AM X5:
IEC 61850, 8:44 X7: Can you please send this manual?
IEC 61850, 8:45 AM IEC:
IEC 61850, 8:45 AM IEC:
IEC 61850, 8:47 AM IEC: Please send manual of relay..
IEC 61850, 8:55 BB2: Required procedures & standards for protection audit for thermal power plants.
IEC 61850, 9:27 AM – A1 1040 Sohail Ahmed: This message was deleted
IEC 61850, 9:28 AM – A1 1040 Sohail Ahmed: For differential protection of DG (ANSI CODE: 87G) which protective relay I have to use, Schneider make.
Kindly suggest me.
IEC 61850, 9:39 XXX50: I am testing 5th harmonic restraint feature of differential relay… But my relay is also picking on 2nd harmonics restraint and 5th harmonics restraints simultaneously. What could be the reason
IEC 61850, 9:40 XXX50: My 5th harmonic is 35%
IEC 61850, 9:40 XXX50:
IEC 61850, 9:40 XXX50: Above figure shows my testing procedure
IEC 61850, 9:41 XXX50: i am ramping from no operate to operate region with 0.05V step
IEC 61850, 9:41 XXX50: the relay gives both 2nd and 5th harmonics restraint indication
IEC 61850, 9:42 XXX50: i have fixed the fundamental freq current at 1A
IEC 61850, 9:42 XXX50: and ramped the 5th harmonics current
IEC 61850, 9:59 AM X6: Hi,
Is there any standard for modeling of LV motors of least size?
Or upto what minimum rating of motor we need to consider for modeling in power system software.
IEC 61850, 10:39 XX: Micom P34x or sepam G87 or P3GXX
IEC 61850, 10:41 XX: From p343 you have differential
IEC 61850, 1:09 XX: http://www.ucaiug.org/Meetings/CIGRE_2014/USB%20Promo%20Content/TOSHIBA/Brochures/GR200_Series_IED/GRZ200%20brochure_12032-0.B.pdf
IEC 61850, 1:11 XX: Z1X shall be zone-1 extension .
Please refer to the explanation given in above pdf file .
IEC 61850, 1:12 XX: X means Zone extension .
What I could understand.
Others can throw more light on this based on the relay manual .
IEC 61850, 1:14 PMX5: Z1X extension zone.. It control zone accelerated this particular zone we have set POTT or PUTT to be set….
IEC 61850, 1:14 PMX5: Depends upon line length we set POTT or PUTT
IEC 61850, 1:15 XX: Yes , super .
This is accelerated control zone depending on line length .
IEC 61850, 1:16 XX: I need to know lot about distance protection .
Can anyone explain me more the about the interpretations of the six zones as defined in this manual ( in above pdf file ).
IEC 61850, 1:17 PMX5: If line length very shortest line we can not get 80 % zone -1 in this case POTT scheme to be adopted
IEC 61850, 1:18 PMX5: Permissible over reach transfer trip..
IEC 61850, 1:20 PMX5: this is MHO characteristic… Now days using quatrilatral characteristics used in distance protection
IEC 61850, 1:22 XX: Yes , for quadrilateral characteristics – what are the interpretations of six zones ( included accelerated tripping )?
Can anyone explain me more ?
IEC 61850, 1:27 PMX5: Normally used 4 independent zone and one control used… it may be vary different country…. In the 4 zone…. 3 zone set forward… One zone is reverse zone…. Zone -1 and zone -1X you can enabled auto reclousure……
IEC 61850, 5:13 XXXX: Z1 extended…
IEC 61850, 5:14 XXXX: Z1XS extended depends on teleprotection
IEC 61850, 8:03 XX: Anyone know about difference between cid , iid , icd , file type
IEC 61850, 8:04 XX: Why we are using this type of file format
IEC 61850, 8:04 XX: I need detail about this
IEC 61850, 8:08 XX: Anyone know about difference between cid , iid , icd , file type
IEC 61850, 8:08 XX: Why we are using this type of file format
IEC 61850, 8:08 XX: I need detail about this
IEC 61850, 10:34 PMX4: Icd is a much common form of sharing communication details of any IED, i.e you can use them for any product IEDs for any SCADA integration
IEC 61850, 10:34 PMX4: Wheras CID, iid are relatively specific
IEC 61850, 8:07 PM – kk 1293 Asad ul Rahman: what are the major protection of alternator from generation point of view
IEC 61850, 8:09 PM – kk 1461 Mohil Mehta: Reverse power
Under frequency
Over frequency
IEC 61850, 8:15 XX: 1). 51 V ( voltage restraint over current ).
2). 81 U & 81 O ( under frequency & over frequency)
3). 78 ( pole slipping ) – depending on the ratings .
4). 32 – Reverse Power .
5). Inadvertent Energisation
6). 51 O/C
7). Under voltage and over voltage
8). Rotor Diode failure relay
9). 💯 percent Stator Earth Fault relay
10). Restricted Earth fault
11). Generator differential.All are from my memory .
Might have missed some of the elements. Note – some of the protection elements are applicable only depending on the generator rating .

IEC 61850, 8:16 KK1: Negative sequence protection
IEC 61850, 8:16 XX: Please consult Schneider protection book ( through internet ).
IEC 61850, 8:16 KK1: 👍
IEC 61850, 8:18 KK: actually iam beginner and working in power house generation station, so i want to get related knowledge
IEC 61850, 8:18 KK: please send in pdf or link
IEC 61850, 8:18 XX: Best book for you to understand all these protection elements – Please consult Schneider protection book ( through internet ).
IEC 61850, 8:19 XX: I have already sent it few days back .
Please check trail of messages .
IEC 61850, 8:19KK: ok
IEC 61850, 8:22KK: sir please can u resend the book? it’s not available in my chat
IEC 61850, 8:23 XX: Shall send it again.No worries.
Please give me time , as I am travelling now , entering in to airport .
IEC 61850, 8:24 XX:
IEC 61850, 8:25 PMX5: Additionaly 1) Field failure protection 2) 100% stator earth fault protection 3) 95% stator earth fault protection 4) Rotor earth fault protection 5) over fluxing Protection..
IEC 61850, 8:26KK: sir bundle of thanks
IEC 61850, 8:26 XX: 100 percent stator earth fault is indicated in my list
IEC 61850, 8:28 PMX5: Yes sir… 100% stator earth fault normally used two method 1) smaller machine 3rd harmonics under voltage method used 2) Larger machine 20hz injection principle used….
IEC 61850, 8:30KK: on which what things should i focus in generating station? as i am working in sugar industry
IEC 61850, 8:33 PMX5: Sir I think 51 V voltage restraint over current Generator directly synchronous with grid like capative plant 51V is used… Where the generator connected through power transformer back up impedance protection will be selected… I am right Sir….
IEC 61850, 8:35 PMX5: Sir Big machine now days using low forward power protection method used….
IEC 61850, 8:43 PMX5: You should focus the following point in generator regularly 1) Generator shaft voltage measurement —Monthly 2) Regularly check carbon brush 3) Rotor earth fault value show in relay 4) If brushless exciter you should check diode fuse healthiness 5)weather AVR all channel in follow up mode or not.and firing control voltage should be equal … 6) AVR thyrister monitoring system 7) generator should be operated in as per capability curve…
IEC 61850, 8:45KK: right
IEC 61850, 8:46 XX: Yes ,
1). I missed few of major .
Overfluxing is of very importance .
2). Additionaly Field failure protection is must . 3) 95% stator earth fault protection 4) Rotor earth fault protection.
IEC 61850, 8:47KK: This message was deleted
IEC 61850, 8:48 PMX5: Uc voltage
IEC 61850, 8:49KK: ok
IEC 61850, 8:50KK: which type of signals are given to ct and pt for protection?
IEC 61850, 8:51 PMX5: sir where generator neutral solid earthing 100% stator earth fault not required…. If generator neutral connected through resistance or NGT 100% stator earth fault is required
IEC 61850, 8:55 PMX5: In Avr all limiter in service or not it is very important point
IEC 61850, 8:56 XX: Generator shall have high impedance grounding to protect stator lamination .
IEC 61850, 8:57KK: This message was deleted
IEC 61850, 8:57 XX: 👍👍👍
IEC 61850, 8:58 XX: Good productive discussion, keep it up 👍.
IEC 61850, 8:58 XX: Catch you later .
IEC 61850, 9:01 PM X5: If generator neutral earthing through high impedence fault current will limit. such case from the generator neutral 5% unprotected zone …bez fault current limited by high impedance earthing… In this case we should adopted 20HZ injection principle used
IEC 61850, 9:02 PM X5: In this case differential will not respond
IEC 61850, 9:06 PM X5: Sir normally before overfluxing Protection Operated In generator.. V/HZ limiter will operate and keep the V/HZ ratio with in limited….
IEC 61850, 9:10 PM X5: Ensure that PSS should be in service it is most important in AVR….
IEC 61850, 9:13 PM X5: Power system stabilizer
IEC 61850, 9:46 XX: Normally even 30 -50 MW sized Generator was recommended for high impedance grounding to save the potential damage on stator lamination . This was as advised by Generator manufacturers ( like ABB , Siemens , Rolls Royce , etc. ) .
In that case , differential will not operate on this small current. We used to use 67 /67N – directional elements to find the faults while generator switchgears bus-coupler is closed . Yes, in this case , we used to use injection of 20 Hz principle to identify the earth fault current .
IEC 61850, 9:49 XX: Is there any parameters you change while doing test 20Hz? Because it would give some different reading with the frequency.
IEC 61850, 9:53KK: pls define 20 hz principal
IEC 61850, 9:56 XX: Please consult Alstom Prag book and Consult with European Generator manufactures .
IEC 61850, 9:57 X2: why the setting of high imp Busbar protection relay is given in term of Voltage? whereas we are feeding it 3-ph CTs
IEC 61850, 9:58 X2: we have siemens 7VH60 relay and its trip setting is 240V. while we are supplying CTs to the relay
IEC 61850, 9:58 X2:
IEC 61850, 10:18 XX: https://electrical-engineering-portal.com/busbar-protection-schemes-principles
IEC 61850, 10:19 XX: Please refer to high impedance principle – why setting is in terms of voltage ?
IEC 61850, 10:21 XX: Voltage across the relay matters while one of CTs gets saturated under through fault condition .
Hence , CTS knee point voltage shall be more than the twice of the voltage across the Relays .
IEC 61850, 10:23 XX: CT switching is required to know which isolator is connected in to the circuit in double bus bar system .
IEC 61850, 10:25 XX: CT switching is also required to ensure the correct bus bar sections are taken in to account ( while bus bar sectionalisers are involved ).
IEC 61850, 10:30 X2: can u explain this in term of one and haldf breaker schee
IEC 61850, 10:30 X2: half breaker scheme*
IEC 61850, 10:31 X2: i have tested high impedance BB relay , and i have applied voltages to the relays to test its tripping setting
IEC 61850, 10:35 X2: i understand if i apply current through relay resistors and there will be a voltage drop across series reisstor and relay will trip according to setting… but during testing i have applied voltage directly to relay….why
IEC 61850, 10:40 X2: oh…maybe its the same thing … whether i apply current to generate required voltage or apply directly voltage to generate circulating current…. gotcha
IEC 61850, 5:40 X6: This message was deleted
IEC 61850, 5:45 X5: I have seen some scheme where the generator connected with through transformer back up impedance protection relay is used.. Generator connected directly with grid with out any step up transformer voltage restraint over current given.. Plz check sir….
IEC 61850, 5:46 X5: Some theory applicable I will explain with you with details….
IEC 61850, 7:17 XX1: Pls share IEC codes of practice while working in substation
IEC 61850, 10:15 KK3: and if step down transformer is used through bus bar then which rely is used.?
IEC 61850, 10:26 K5: Generator never connected with step down transformer…. For your kind information
IEC 61850, 10:32 KK3: no I’m saying that when transformer connected with bus bar
IEC 61850, 10:48 K5: Bro tell me exactly
IEC 61850, 10:49 KK3: always we use stepdown transformer when connected bus bar. right??
IEC 61850, 10:50 K5: Generator????
IEC 61850, 10:53 KK3: at my site generator is connected to bus bar then step down transformer is used through bus bar. now in this condition which rely is used
IEC 61850, 11:10 XX8: My brother ,
Your configuration is non – standard in engineering.
Generator is always connected with GSU ( Generator Step Up ) Transformer – as per standard practices in all power generating plants .
IEC 61850, 11:13FF4: It seems that generator capacity is of few MWs,.
Generator is connected to HT panel or we can call it as Generator switchboard.
And then outgoing Feeder is connected to step down Transformer to cater plant auxiliaries.
IEC 61850, 11:14 KK3: yes our Generator capacity is 6MW
IEC 61850, 11:16 KK3: 2×6 mw
IEC 61850, 11:17 XX8: Yes , this is the typical configuration in offshore oil & gas platform and FPSO .
However , even in that case , Voltage Restraint Relays must be implemented as part of multifunction generator protection relays .
IEC 61850, 11:18 XX8: I have never seen some relay ( called as back up impedance ) has replaced Voltage Restraint Relay .
IEC 61850, 11:19 XX8: I mean Voltage Restraint Over Current Relays .
IEC 61850, 11:19FF4: What are all the protections, do you have in that relay…
IEC 61850, 11:20 KK3: which type of relay is used in that type of power system for transformer prtection
IEC 61850, 11:21FF4: Does your query related to generator protection or transformer protection
IEC 61850, 11:22 KK3: trosformer protection
IEC 61850, 11:24FF4: For transformer we need not to have 51V protection.
IEC 61850, 11:26 KK3: reason?
IEC 61850, 11:27 AM X5: Where oltc is there….we don’t need but rest we need it
IEC 61850, 11:27 XX8: For 5 MVA & above ,
We should have following-

1). 50/51 – Idmt oc with high set
2). Differential
3). REF
4). Standby Earth Fault .

Over fluxing for very high rated transformers
IEC 61850, 11:28FF4: https://www.electrical4u.net/relay/voltage-restrained-current-relay-basic-concept-51v-voc/
IEC 61850, 11:29 KK3: we have upto 2.5MVA transformers
IEC 61850, 11:29 XX8: Plus Mechanical protection ( Buccholtz , Oil Temperature & Winding temperature high alarm & trip , OlTC surge , etc ).
IEC 61850, 11:31 KK3: if we don’t use bucholtz relay, will it impact on transformer?
IEC 61850, 11:52 XX8: Yes , buccholtz relay is required for all oil transformers ( not for sealed transformers ).
IEC 61850, 11:55 X7: Can we refill the oil for sealed transformer insite
IEC 61850, 11:58 XX8: No / only by the manufacturer.
It’s filled under special conditions.
Talk to the transformer manufacturer.
IEC 61850, 11:59 XX8: Please talk to the equipment manufacturers.
IEC 61850, 12:00 PMX13: Monthly maintenance of Transformer??
IEC 61850, 12:00 XX: Ok sir thank u
IEC 61850, 12:02KK: rite
IEC 61850, 12:17 X2:
IEC 61850, 12:17 X2: Hi to all..can you suggest anyone for the above doubt
IEC 61850, 12:18 X2: Whether J17and J18 default for modbus
IEC 61850, 5:01 PM – Shan: That will be for plants auxiliary load etc
IEC 61850, 5:17KK: yes
IEC 61850, 5:29 PM X5: Can anyone know from where crack version of PSSE can be downloaded?
IEC 61850, 5:33 PM XX: You can download it freely from Simense website for 50 buses
IEC 61850, 6:00 PM – Shan: 50 buses but it crashes during simulation
IEC 61850, 6:00 PM X5: No I need full version
IEC 61850, 6:06 PM XX: It’s working fine in my case.
IEC 61850, 6:06 PM XX: I will share link
IEC 61850, 6:23 X2: We are getting 64R error fault in Micom P391.any one have idea about to solve this and any one have commissioning steps and what should We pay attention for this?
IEC 61850, 6:24 X2: This message was deleted
IEC 61850, 6:24 X2: Can I expect any reply to solve this??
IEC 61850, 6:28 XX: 1 ). Check all 03 CTs – polarity in phase sides for 3 phases .
2). Check CT polarity in neutral side.

This the ist step .
3). Then check relay healthiness status .
4). Carry CT primary injection to verify the CT ratios
5). Carry out CT secondary injections .
6). Carry out stability check
7). Carry out sensitivity check
IEC 61850, 6:30 PMX5: Sir micom p391 for rotor earth fault injection module sir
IEC 61850, 6:30 PMX5: Tell me what kind of help u required???
IEC 61850, 6:31 PM – Shan: But when u change parameters, reactive compensation devices etc, will crash. Secondly it’ll also has some missing module like Nova for eigen value analysis etc….
IEC 61850, 6:32 X2: Thanks for replying. We are getting this 64R error in P391
IEC 61850, 6:32 PM – Shan: Full version????
IEC 61850, 6:32 XX: Sorry , I thought that 64R – you are asking for Restricted Earth Fault fior Transformers
IEC 61850, 6:32 X2: Yes your are ✅
IEC 61850, 6:32 X2: No this will go with P34x
IEC 61850, 6:33 PMX5: 25 V, 0.25HZ or 0.5 HZ, or 1Hz injection module
IEC 61850, 6:34 X2: We need to solve this and what may the issue for this and do you have commissioning procedure for this and what should we pay attention to avoid this
IEC 61850, 6:34 PMX5: Square wave form
IEC 61850, 6:37 PMX5: Yes
IEC 61850, 6:37 PMX5: I have commissioned
IEC 61850, 6:37 X2: Can you share
IEC 61850, 6:37 PMX5: Ok
IEC 61850, 6:37 X2: Thanks a lot 🙏
IEC 61850, 6:37 PMX5: Tomorrow will call u
IEC 61850, 6:38 X2: Please
IEC 61850, 6:38 X2: Actually I am in Saudi
IEC 61850, 6:38 PMX5: Ok
IEC 61850, 6:38 X2: We can discuss in messenger
IEC 61850, 6:39 PMX5: What type of excitation you are using this relay
IEC 61850, 6:39 PMX5: Brushless
IEC 61850, 6:39 PM – Karia: Guys please continue in this bcoz other members get knowledge for the same.
IEC 61850, 6:40 X2: I need to check this with customer
IEC 61850, 6:40 PMX5: Ok fine tomorrow I will share here
IEC 61850, 6:41 X2: That will be fine
IEC 61850, 6:41 PMX5: Manual also commissioning procedure given
IEC 61850, 6:41 X2: Any idea regarding this error issue..which scenario this will occur
IEC 61850, 6:42 X2: Yes I am checking
IEC 61850, 6:42 X2: P34x manual right?
IEC 61850, 6:42 PMX5: Error in P343 relay is in
IEC 61850, 6:42 PMX5: Yes
IEC 61850, 6:42 X2: Yea I downloaded now
IEC 61850, 6:43 PMX5: Wait I will send the page no
IEC 61850, 6:43 X2: Please
IEC 61850, 6:44 PMX5:
IEC 61850, 6:45 PMX5: Which value is showing in relay
IEC 61850, 6:45 PMX5: ???
IEC 61850, 6:45 X2:
IEC 61850, 6:46 PMX5: Where is p34x value
IEC 61850, 6:47 X2: As I understood that relay HMI Shows only this error
IEC 61850, 6:48 X2: Actually i am coordinating remotely
IEC 61850, 6:48 PMX5: Bro this is under voltage protection
IEC 61850, 6:49 PMX5: Not rotor earth fault
IEC 61850, 6:59 X2: Are you talking error or relay
IEC 61850, 7:00 X2: If it is relay,I am sure that P391 used here for rotor EF
IEC 61850, 7:08 X2: As understood that this is due to rotor primary resistance from CLIO connected to P391
IEC 61850, 7:09 PM X5: What is backup protection to rotor earth fault in generator.
IEC 61850, 7:09 X2: Current loop input
IEC 61850, 7:25 PMX5: Tell me
IEC 61850, 7:25 PM X5: I m asking in group? 😂
IEC 61850, 7:31 X2: Any idea in this??
IEC 61850, 7:35 KK1:
IEC 61850, 7:35 PMX5: It depends upon fault when rotor winding get open.. Machine will be tripped Filed failure protection…. Normally in the rotor first earth fault allowable .if second earth fault occurred machine will get high vibration due to in Equal EMF in the rotor winding result turbine tripped high vibration and following GCB open low forward power or reverse power.. Any one …
IEC 61850, 7:36 PMX5: Rotor earth fault and vibration both occurred simultaneously….
IEC 61850, 7:38 XX: This message was deleted
IEC 61850, 7:41 XX:
IEC 61850, 7:43 XX: Bro , Please see in the above siemens handbook – how 20 hz generator is introduced to detect the rotor field failure .
IEC 61850, 7:43 PMX5: xc = 1/2πfc. Frequency reduced increase XC value
IEC 61850, 7:45 XX: Yes , low frequency gives higher impedance , hence low current and low loss in this system .
IEC 61850, 7:45 PMX5: For relay measure better resistance value we go for subharmonics injection method use for 100% stator earth fault relay
IEC 61850, 7:56 X21: Any one is having IEC codes of electrical installation
IEC 61850, 7:59 XX: Good
IEC 61850, 8:22 PMX5: Sir, 20HZ used for 100% stator earth fault… 25V (0.25HZ , 0.5HZ,1 HZ) square wave form used for rotor earth fault protection
IEC 61850, 8:33KK: what is 20hz principle pls define
IEC 61850, 8:37 PMX5: This message was deleted
IEC 61850, 8:38 PMX5: For generator 100% stator earth fault protection 20HZ injection method used
IEC 61850, 8:41 XX: But 20Hz. Is there any specific reason to apply 20Hz frequency?
IEC 61850, 8:42 PMX5: Better relay measure high impedence value….
IEC 61850, 8:46KK: in this condition capacitive reactance increased
IEC 61850, 8:46 PMX5: Yes I am also say same thing
IEC 61850, 8:50 PMX5: Relay can not measured capacitance .
IEC 61850, 8:52 PMX5: Up-to you
IEC 61850, 8:52 PMX5: But relay never show capacitance value….
IEC 61850, 8:55 PMX5: This is simple formula for why 20hz injection method used for protection…..
IEC 61850, 9:29KK:
IEC 61850, 9:30 PM IEC: Kindly share for transformer…
IEC 61850, 9:34KK: sure
IEC 61850, 9:35KK:
IEC 61850, 9:36 PM IEC: Tq.. Boss.
IEC 61850, 9:37KK: 👍
IEC 61850, 10:44 X2: If angle between two volatge sources of same amplitude say 50V, are connected together. How will phase angles of 0,180, or 90 degree between them effect the resultant volatge
IEC 61850, 10:48 X2: To put it simply, i want to generate 300V ph-ph from my test set using two voltage channels, for relay testing
IEC 61850, 10:49 X2: When i put angle of 1 voltage channel 0 degree and other channel angle 180 degree, then i get addition of two voltage channels
IEC 61850, 5:34 AM – Bangladesh: Kindly share for line protection
IEC 61850, 10:58 KK3: i have this doc related to power line, it may be benifecient for some one
IEC 61850, 10:58 KK3:
IEC 61850, 11:05 K5: Can you One elabrate difference between field failure with out under voltage & field failure with under voltage..????
IEC 61850, 11:12 AM X5: When u give copy paste answer from internet on backup protection to field earth fault…..😂😂
IEC 61850, 11:16 KK3: its very important question, ans is needed from experts
IEC 61850, 11:18 AM X5: Yes ..very true…. Even I am waiting from experts..
IEC 61850, 11:30 K5: I am not copy from internet….if you don’t know keep silent…. Don’t discourage any one….
IEC 61850, 11:34 XX: This message was deleted
IEC 61850, 11:34 XX: I too agree this..this is open forum so any one can ask any doubts👍
IEC 61850, 1:08 X2: Can i use Digsi5 software free for learning purpose?
IEC 61850, 1:16 PM – J 1000 3879 Shailesh Pal: Yes for 30 day traile version
IEC 61850, 1:17 X2: 👍🏻
IEC 61850, 1:37 X2: Does anyone know about professional certification of IEC61850 which is recognized internationally
IEC 61850, 3:38 PM X5: SEL University
IEC 61850, 3:38 PM X5: ABB
IEC 61850, 5:51 X24: Thanks Marc…
IEC 61850, 5:53 PM X5: People can search on internet. Here we share actual experiences.
IEC 61850, 5:58KK: welcome sir
IEC 61850, 5:58 PMX5: If you have experience then you can share your experience… Why you have written negatively….
IEC 61850, 6:01 PM X5: https://www.quora.com/What-is-meant-by-the-rotor-earth-fault-in-a-generator-How-can-I-test-this-protection
IEC 61850, 6:01 PM X5: Your answer @sridharan 😂 👆🏻👆🏻
IEC 61850, 6:02 PM X5: Because everyone here can search from internet but once practical exp. Is shared then it has lot of meaning to all members….
IEC 61850, 6:08 XX: This is very innovative and creative discussion.
There should not be any arguments on this .
IEC 61850, 6:10 XX: This type of innovative and helpful discussion is the very purpose of creating this group .
IEC 61850, 6:10KK: ofcourse
IEC 61850, 6:11 XX: Let us become more constructive rather than being divisive.
IEC 61850, 6:13 XX: I have been really enjoying the reading of all discussion here including rotor earth fault in quora .

Cheer up man .
IEC 61850, 6:39 XX: These methods are not effective.
IEC 61850, 6:39 XX: Instead use surge cycle test or RSO graph method to find actual rotor earth fault
IEC 61850, 6:40 XX: This will not give correct location but will be confirmed that there is earth fault
IEC 61850, 6:53 PM X5: Exactly 👍
IEC 61850, 7:01 PMX5: Bro RSO offline test..when Generator running condition RSO test could not applied… Rotor earth fault protection relay when generator running condition any rotor earth fault occurred it will shutdown the unit….
IEC 61850, 7:04 X2: What is the avg load of 1bhk and 2 bhk flats??
IEC 61850, 7:06 PMX5: RSO is a testing part….. 64R is a relay protection….. Both are different
IEC 61850, 7:17 XX: yes. That is diagnostic test to identify fault
IEC 61850, 7:20 XX: no
IEC 61850, 7:20 XX: see what I have mentioned
IEC 61850, 7:21 PMX5: Which Method find locations of fault can you elaborate here…
IEC 61850, 7:22 XX: As of now there is no method which can declare location of fault
IEC 61850, 7:22 PMX5: Ok
IEC 61850, 7:23 XX: How to calculate Earthing conductor size for a perticular Switchgear.

Anyone can send its calculation to me ?
IEC 61850, 7:24 PMX5: If fault in retaining ring area near Current carrying Bolt we can identify with help of boroscope inspection…
IEC 61850, 7:25 PMX5:
IEC 61850, 7:26 PMX5:
IEC 61850, 7:26 PMX5: Recently one of the 600MW machine rotor winding opened in j starp area near C. C Bolt….
IEC 61850, 7:43 PM – Elec-Engg.com support team: Protection Relay Discussion Group in Telegram

https://t.me/joinchat/Cmyg2FiXX-qlTYqyXQ_pjg
IEC 61850, 10:24KK: why differential relay does not work properly in high impedence grounding??
IEC 61850, 11:29 XX: Reason – Earth fault Current is limited by high impedance resistance to vet low value , for which differential relay does not enough sensitivity to operate .
IEC 61850, 11:30 XX: *very low value .
IEC 61850, 11:31KK: right
IEC 61850, 5:25 PMX5: For cylinderical rotor how much load angle allowable stability limit???
IEC 61850, 7:01 X8: Anyone Secure Elite 115 MFM Parameters setting manual
IEC 61850, 7:02 X8: Please share
IEC 61850, 7:20 XX: Any one can tell us the correct response ?
Is it from 90 degree position – plus 30 to minus 30 degree ?
Not sure ????
10/18/20, 5:17 XX:
10/18/20, 5:17 XX:
IEC 61850, 12:32 X5: *India’s first vertical GIS substation*

Sterlite Power’s Gurgaon Palwal Transmission Ltd. (GPTL) project holds a unique distinction. It is home to ‘India’s first vertical GIS substation’- a game-changing solution that has revolutionised the global power transmission sector by innovatively addressing the critical challenge of space.
Gurgaon Palwal Transmission Ltd. is a 130 km-long Inter State Transmission Line built in an urban landscape, right in the heart of Gurugram and its neighbourhood.

Gurugram is a growing economic powerhouse. Understandably, this bustling industrial region registers a high demand for electricity to power its densely populated commercial and residential areas. Building a linear transmission power project in the heart of Gurugram meant a major challenge in terms of paucity of space. Moreover, the transmission lines and towers had to pass through prime real estate and securing the right-of-way (ROW) was a complicated affair. Securing land parcels for constructing three Gas-Insulated Substations (GIS) at Prithla, Kadarpur and Sohna Road was also an uphill task for the team as a conventional 400/220 kV substation, which spreads out laterally, requires nearly 12 acres of land.

In response, the engineering team at Sterlite Power came up with a brilliant idea – a vertical substation which, as the name goes, was developed as a compact, multi-storeyed structure. The innovative idea houses the 400 kV GIS equipment on the ground floor, the 220 kV GIS on the first floor and the open 220 kV switchyard on the roof. The entire GIS substation occupies just 3.8 acres, thus, reducing the land required by as much as 75 percent. There were other space-saving innovations too. For instance, the project built multi-circuit monopole towers across the transmission path, using micro piling to create the foundations.
In addition to space-saving, another remarkable advantage of these vertical substations is the reduced carbon footprint. In the GPTL project, these substations have offset more than 18,000 tons of carbon dioxide emissions annually, vis-à-vis its conventional counterparts. Since real estate for urban power projects remains a continuing challenge the vertical substation design packs a power punch given the numerous advantages. By optimising the use of available land, it offers cost and space efficiencies. Sterlite Power has filed a patent application for this innovation.

In April 2020, amidst the national lockdown owing to the pandemic, the project was successfully commissioned with help from the local administration. It is fully operational today and true to its commitment, playing a vital role in evacuating about 2,000 MW of reliable power to more than three million households in Haryana. By ensuring a reliable supply of power, the GPTL project would be instrumental in reducing the use of highly polluting diesel generator sets in Gurugram and the adjoining areas of Manesar and Palwal, thereby helping to make it DG-set free.

Built on a robust foundation of technology and innovation, GPTL has been a true manifestation of our core purpose — ‘Empowering humanity by addressing the toughest challenges of energy delivery’.
IEC 61850, 12:32 X5:
IEC 61850, 12:32 X5:
IEC 61850, 12:32 X5:
IEC 61850, 12:33 PM X5: 👍🏻
IEC 61850, 12:56 X2: Do we use phase-phase VTs for Line overvoltage relays or phase-ground VT?
IEC 61850, 12:58 X2:
IEC 61850, 1:00 PM X5: Phase to ground VTs.
IEC 61850, 1:00 X2: and what is 59N – Neutral overvoltage protection?
IEC 61850, 1:02 X2: also Negative seq Over-voltage 47 and Positive seq Under voltage 27D prtection? where they are used? i have never seen these two relays in HV Transmission line
IEC 61850, 1:04 X2: i know OR is for Enabling a feature… But in setting we have OR, AND, NOT
IEC 61850, 1:06 PM X5: In high resistance power system, the the detection of fault current becomes very difficult due to low magnitude of current. Hence a 59N is used to identify earth fault. During normal conditions Vector sum of phase voltages is zero. During fault this voltages across NGR is not zero and this voltage shows a earth fault in the network
IEC 61850, 1:08 X2: Nice… Thanks
IEC 61850, 1:08 X2: can you tell me where this type of relay mostly used?
IEC 61850, 1:09 PM X5:
IEC 61850, 1:09 X2: i have never seen in our HV transmission line protection system
IEC 61850, 1:09 PM X5: Used in distribution system…. Not in EHV….
IEC 61850, 1:09 X2: great
IEC 61850, 1:10 X2: thanks
IEC 61850, 1:10 PM X5: Also in generator protection…. & Motor protection….

IEC 61850, 1:11 X2: awesome
IEC 61850, 1:17 PM X5: This message was deleted
IEC 61850, 1:17 PM X5: It was DGR Relay ( Directional Ground Fault Relay). It uses voltage pick up and (current pick up with apporiate swap angle )
IEC 61850, 3:11 X2: Thank u
IEC 61850, 4:25 XX: It’s great 👍.
IEC 61850, 4:35 XX: That’s absolutely right .
Also for Switchgear while bus coupler is closed , then the incomer connected to faulty cable is isolated rather than the other heathy incomer . This is based on the current direction towards the fault feeding .
IEC 61850, 4:36 XX: All these are perefect examples of directional earth fault relays .
IEC 61850, 5:11 XX: Hello sir , I’m Lalit chaudhari graduate from Pune university with 8.72CGPA fro marashtra looking for great opportunity in GIS substation
IEC 61850, 5:51 X2: Hi everyone
Good Evening
I need your some help.
if anybody have schneider Easergy P3L30 setting calculation excel sheet please share with me.
Email id – nkverma56837@gmail.com
IEC 61850, 6:14 XXXX: I was interested too. ruverbr@gmail.com. Very good.
1IEC 61850, 12:18 X8: Anyone suggest which type of Paint need to done inside 11,KV HT panel wall
1IEC 61850, 12:18 X2: ??
1IEC 61850, 2:55 RR5: It is a Varistor
1IEC 61850, 4:25 X2: What is Single phase pickup factor for ABB RET670 Differential relay ?
1IEC 61850, 4:25 X2: whats the use of it?
1IEC 61850, 4:30 PM RR5: 1.5
1IEC 61850, 4:30 PM RR5: For start winding
1IEC 61850, 4:31 X2: can u tell me whats the use of it? i have tested my relay using 1.5 PU factor on both HV and LV sides and results were okay but i dont know why we use it?
1IEC 61850, 6:15 PMX5: I think single phase pickup value 1.5 will be multiplied ….
1IEC 61850, 7:21KK: whats mean by PU
1IEC 61850, 7:36 PM – X9: If it is in relay..then it’s pich up value
IEC 61850, 7:38KK: pich up or pick up?
1IEC 61850, 7:44 PM – X9: Sorry it’s pick up
1IEC 61850, 7:51KK: ok
1IEC 61850, 9:46 X2: Why we have timer in transfirmer overflux protection? And how its works….
1IEC 61850, 9:47 X2: And how it effects the trip time
1IEC 61850, 9:48 X2: I have seen testing of overflux relay today.. Everyone overflux relay was tripped during testing, we have to manually reset the timer
1IEC 61850, 9:50 X2: Every time*
1IEC 61850, 9:53 X2:
1IEC 61850, 12:29 XX “: It works based on V/f ratio. As we know the flux in the core is proportional to that ratio but we need some time to avoid mal-operation in cases of temprorary over volts or under freqs.
1IEC 61850, 7:51 X2: Hi Any one know which soft signal need to use for THD inside Cid file in Micom P142 relay
1IEC 61850, 7:52 X2: Is it possible to assign THD in P142 ?
1IEC 61850, 7:53 X2: Ans which signal need to use for setting gruop change?
1IEC 61850, 7:54 X2: I can see this control output and where I can find virtual signal?
1IEC 61850, 8:31 XX: Yes , v/ f is proportional to flux for any magnetic cores .
If frequency declines beyond a certain value , or , voltage increase beyond a certain values , flux will be saturated And as well Saturating the transformer cores, while the magnetic core will follow the BH curve beyond knee point values .
1IEC 61850, 8:31 X2: That i know.. I was asking about timer
1IEC 61850, 8:32 XX: No idea , my boss .
1IEC 61850, 8:32 X2: 🙂
1IEC 61850, 8:33 XX: Transformer manufacturer can tell you how much time you can allow this saturation.
1IEC 61850, 8:33 X2: 👍🏻
1IEC 61850, 8:35 XX: Sorry , due to my cerebral insufficiency, I am not being able to to recall lot of things .
1IEC 61850, 8:38 PMX13:
1IEC 61850, 8:38 PMX13:
1IEC 61850, 8:38 X2: I think when transformer overexcites then its core get heated due to eddy losses… And overflux relay acts as a thermal overload relay… Timer is something related with cooling time after overexcitation
1IEC 61850, 8:42 PMX13: But Buchholz relay not operate..
1IEC 61850, 8:43 X2: No… Bucholz relay operate on winding short circuit and severe internal faults… Transformer core does get too hot instantaneously
1IEC 61850, 8:44 PMX13: Then What to do.. Sir
1IEC 61850, 8:44 XXXX: floating firm ground or harmonicas
1IEC 61850, 8:44 X2: Thats why we install overflux relay to protect transformer core
1IEC 61850, 8:45 X2: From getting saturated and heated
1IEC 61850, 8:45 XXXX: Have oscillograms?
1IEC 61850, 8:45 X2: Yes. Main question is how?
1IEC 61850, 8:46 X2: I have heard the timer affects the trip time also
1IEC 61850, 8:46 XX: Overfluxing
1IEC 61850, 8:47 X2: ABB manual on timer is too complex
1IEC 61850, 8:47 XX: Read B-H curve
1IEC 61850, 8:47 PMX13: How to protect overflux relay of cubical box.
1IEC 61850, 8:47 X2: 👍🏻
1IEC 61850, 8:48 XXXX: for this type of occurrence you need to enable 59G
1IEC 61850, 8:49 PMX13: Transformer rating we use 2MVA
1IEC 61850, 8:50 PMX13: It’s fault comes to when we start reconnect the line from grid side.
1IEC 61850, 8:51 XXXX:
1IEC 61850, 8:52 X2: Any one know this??
IEC 61850, 8:52 PMX13: Yes
1IEC 61850, 8:56 XXXX: You have oscillograms of occurrence?
1IEC 61850, 8:58 PMX13: No
1IEC 61850, 9:00 PMX13: Any one work on waidmular software..??
1IEC 61850, 9:32 XX: Can you please see if directional over current is operating during this event in the fault recorder ?
1IEC 61850, 2:38 XX4: Can you share SLD, and spec’s?
1IEC 61850, 2:45 XXX52: three-wire diagram and protection also.
1IEC 61850, 5:06 AM X5: Ferroresonance
IEC 61850, 6:20 AM X6: I’ve heard of this type overvoltage. This may be the problem. But need detailed analysis to confirm.
IEC 61850, 6:45 AM X5: To resolve share SLD & transformer details… & VT specs.I have resolved many such issues in 33kV system..1IEC 61850, 9:18 KK3: how to calculate impedance voltage % of 2500kv transformer
IEC 61850, 9:41 XX80: Today CT blast in the cubical box..
IEC 61850, 9:42 XX80: Before two days or blast
1IEC 61850, 9:43 XX80: Please suggest me can we use any protection equipment..
1IEC 61850, 10:12 AM X5: Check the possibility of secondary open?
1IEC 61850, 10:16 XX8: Percentage Impedance = ( Transformer Rated MVA / Fault MVA ) .
Find out the system fault MVA from the drawings / documents .
Consider infinite bus only .
1IEC 61850, 10:18 XX8: Over voltage protection is required .
Voltage appearing across the CT during the fault condition needs to be calculated .
1IEC 61850, 10:22 XX8: Have you checked CT secondary is always shorted through some gravity type shorting mechanisms.
CT blasting shows 1). Either CT secondary got open circuited
2). Or , Dangerous over voltage has arisen across CT secondary during fault condition . You need to calculate this voltage across CT through Knee point voltage .
1IEC 61850, 10:23 XX8: Have you taken out any relays / meters from CT secondary ?
1IEC 61850, 11:05 KK3: if fault MVA is not found
1IEC 61850, 11:09 XX: Any thumb rule for Considering Tendering and estimation purpose.
1IEC 61850, 11:29 AM – kk 1306 Ashutosh Kumar: How can we check time synchronisation has been done through SNTP in reyrolle siemens (7SR11) relay.
Is there any specific signal for confirming time synchronisation done..
1IEC 61850, 11:49 XX8: Consider LV fault Current as 50 kA , and then calculate Fault MVA
1IEC 61850, 11:52 XX8: Bro ,Question is not clear enough to clarify .
Time synchronisation is through GSM antenna and then protection system & event recorder time stamping
1IEC 61850, 11:53 AM – kk 1306 Ashutosh Kumar: This message was deleted
1IEC 61850, 11:54 AM – kk 1306 Ashutosh Kumar: Time synchronisation has been done like siprotech devices” clock synchronisation” ok
1IEC 61850, 4:32 X2: Rio file is possible in Kocos Arts 440??
1IEC 61850, 5:40 XX: Then it should be fine , my bro .
1IEC 61850, 5:43 XX: Thumb rule fir LV system fault kevel to be considered as 50 kA .
From there you can calculate percentage Impedance . It will be approximately around 6% for 2.5 / 2 MVA transformer.
If I am wrong , please correct me .
That’s enough for tendering purpose .
1IEC 61850, 5:45 X2: Okay thanks.
1IEC 61850, 5:50 KK1: Or for the worst case LV system fault level can be assumed as 65kA..
1IEC 61850, 5:50 X2: During maintenance.. hve u took its megger valure (IR)..
1IEC 61850, 8:08 X2: can anyone guide me about ISKRA MT860 energy meters different Registers? like IEC 61850, 5:02 K5: Find % impedance calcultion we can find during short-circuit test of tx
1IEC 61850, 5:04 XX8: Marc,
This is the conceptual process while secondary is short circuited .
1IEC 61850, 5:05 K5: I think you are asking calculate fault level impedance when rated voltage applied in TX such conditions 3 phase short circuit occurred we find fault impedance….
1IEC 61850, 5:07 K5: Normally In site level confirm the % impedance test like this way….
1IEC 61850, 5:08 K5: If some other method available can share here that helpful for everyone… 👍👍👍👍
1IEC 61850, 6:08 XX8: This is the best process to understand percentage impedance
1IEC 61850, 8:54 AM X6: 👍
1IEC 61850, 8:55 AM -092: 👍👍👍
1IEC 61850, 9:25 AM – slam”: Guys, If you have Thermal Overload Calculation Please send me…
1IEC 61850, 9:26 AM –  Islam”: Please give me Thermal Overload settings calculation…
1IEC 61850, 10:24 XX: You can get from mics and pics document
1IEC 61850, 10:24 XX: This is quality bit
1IEC 61850, 10:27 AM  Hello
How to test in Micom p630 Transformer diff prot..2 nd hormonic…check..ple send format…
1IEC 61850, 11:00 X7: I need detail information about each bit
1IEC 61850, 11:03 XX: https://www.se.com/us/en/download/document/P44y_PM/
1IEC 61850, 11:04 XX: You need to ref website to take respective relay ‘so documents
1IEC 61850, 11:06 AM – AA : Anboday has prate 800c debugging software?
1IEC 61850, 12:21 PMX5: Setting plz🙏🙏🙏 I can guide you
1IEC 61850, 12:23 PMX5: Relay Manufature ????? Plz
1IEC 61850, 1:53 PM “: Schnieder
1IEC 61850, 1:54 PM – “: Schneider or ABB
1IEC 61850, 7:38 X2: Does anyone have ELMA software crack for applied precision energy meter testing
1IEC 61850, 7:45 X2: This message was deleted
1IEC 61850, 8:20 X2: Or anyone can share testing protocol which i can import in PTE control software
1IEC 61850, 9:30 PM -“: Schnieder
1IEC 61850, 9:31 PM – AA “: You can send me!
1IEC 61850, 9:34 PMX5: Relay model bro 🙏🙏🙏🙏
1IEC 61850, 9:34 PM – AA “: Micom P3U30
1IEC 61850, 10:11KK: ofcourse got it
1IEC 61850, 10:20 XX: This message was deleted
1IEC 61850, 10:20 XX: Sridhar ,
What should be over load setting in this MICOM P3U30 .
Say motor full load current = 100 amps ,
Then overload current in primary of CT shall be 1.25X100=125 Amps ,
Then in overload setting in CT secondary ( in overload relay ) shall be = (125 Amps / CT ratio ),
My question now what shall be Time Setting ?
Can you please throw some light on this ?
1IEC 61850, 10:37 PM -“: Sir, If you have any document/pdf file please send me….
1IEC 61850, 10:41 X2: Is it for non latching contact type?
1IEC 61850, 10:53 PM – kk 1318 Thanigaivel Pachaiyappan joined using this group’s invite link
1IEC 61850, 11:17 X2: FnKey LEDs vs Simple LEDs?
IEC 61850, 12:19 AM – kk 1337 Humayun Ahsan: @923458092813 Dwell contact type means the corresponding output conact will remain closed for the set time once get energized by a function.
Normally it is required for scada annunciation where a specific delay is required for signalling.
IEC 61850, 12:20 XXX50: 👍🏻
IEC 61850, 12:36 AM – kk 1451 Mehdi Mohammadi:
IEC 61850, 12:37 XXX50: Thanks
IEC 61850, 12:37 AM – kk 1451 Mehdi Mohammadi: 👍
IEC 61850, 9:10 XX4: How to upgrade frim version of Siemence 7SA522 from V4. 2 to V4. 3 ?
IEC 61850, 10:36 X7: Anyone have siprotech 5 pirated copy
IEC 61850, 10:36 X7: I mean Digsi 5
IEC 61850, 10:37 AM RR5: Firmware have to update
IEC 61850, 1:48 X24: How to update plz detials
IEC 61850, 2:03 X24: How to update frimware of Siemence 7SA522 from V4. 2 to V4. 3 ?
IEC 61850, 2:11 XX: ????
IEC 61850, 2:12 XXXXX: Hi plz install firmware loader of Siemens and then download the firmware file from Siemens website for version 4.3 and from loader upload as per instruction but also note in some Siemens relay when u upload firmware the relay gives u error so u need to initialize the relay and have to create the the relay file as per project specific but some Siemens relay does not need that too thanks
IEC 61850, 2:17 X2: Can anyone help me with the password of REBCON? Thanks in advance.
IEC 61850, 2:43 PM RR5: Please try – System
IEC 61850, 3:56 X24: Thanks ahmed
IEC 61850, 3:57 X24: I am trying this
IEC 61850, 4:01 X2: System is for REBWIN….
IEC 61850, 5:54 X2: I also faced this same issue. What i did is took this record, used other software to check approximate distance.
IEC 61850, 6:06 XX: This needs to be reported to ABB. We need the relay to give us the correct information on the display.
It helps to inform field personnel to react faster, than waiting do one to go on a computer and start analysing data from the relay.
IEC 61850, 6:11 XX: In case MICOM distance Relay – we faced the similar discrepancies in terms of wiring distance measurements while there is ground fault created in the long cable outgoing feeder in to the grid.
IEC 61850, 6:12 XX: Relay manufacturer representatives were called and it was resolved .
IEC 61850, 6:52 PM X5: Can you share relay project file?
IEC 61850, 6:54 XX: Share the pcmi file
IEC 61850, 7:16KK: pls guide that how to identify type of NGR
IEC 61850, 7:44 XX: It’s good to tell them when there are such issues. It’s helps them to improve and give us better products
IEC 61850, 7:45 XX: Did they give you feedback about where the problem is
IEC 61850, 7:46 XX: It’s relay malfunction or settings error
IEC 61850, 8:09 PM RR5: During testing this distance showing?
IEC 61850, 8:19 X2: Yes
IEC 61850, 8:19 X2: Phase to phase fault dist is ok… Problem is witg phase to earth fault
IEC 61850, 8:20 X2: Did you trace the fault? Reason behind this issue
IEC 61850, 8:21 PMX5: May be not properly configure mutual compensation
IEC 61850, 8:21 PM RR5: Can you share pcm confg picture as well as fault locator setting
IEC 61850, 8:28 PM RR5:
IEC 61850, 10:28 X2: Sure
IEC 61850, 10:30 X2:
IEC 61850, 10:31 XX: Fault locator settings shall be the prime criterion to find out the line to group fault , which is more frequent faults than any other type of faults .
IEC 61850, 10:32 X2: i think issue is with logic signals. setting parameters are ok
IEC 61850, 10:32 X2: i have shared the PCM

IEC 61850, 10:34 X2: <Media omitted>
IEC 61850, 10:34 X2: <Media omitted>
IEC 61850, 10:36 X2: If anyone can look into logic, i would be very thankful
IEC 61850, 10:46 X2: shared
1IEC 61850, 2:26 zz1: @923458092813 make sure your distubance record trigger settings are fine
DREP
1IEC 61850, 6:28 XXX5: <Media omitted>
1IEC 61850, 6:29 XXX5: Indias first 1,200-Kv Substation.India’s power sector will witness a new era in the transmission segment when state-run Power Grid Corp will launch a 1,200-Kv ultra-high voltage (UHV) test station along with experimental lines in Bina, Madhya Pradesh. The investment for the project is estimated at Rs 800 crore. The company is also setting up a 1,200-Kv transmission line for commercial purpose, which will be constructed between Wardha and Aurangabad in Maharashtra.
Till now, the power is transmitted on 765Kv /800Kv lines. The existing 400Kv line can transfer about 600 Mw power, 800Kv line can do between 1,200 Mw and 2,400 Mw and 1,200-Kv transfer 6,000-8,000 Mw, according to experts from the Indian Electrical and Electronics Manufacturers Association (IEEMA), which is associated with the project. With the government’s plan of adding over 100,000 Mw capacity in the coming 12th Plan coupled with the challenges put up by environment hurdles, right of way and transmission losses, there is a need to develop a more sound transmission system.
About 35 manufacturers, including BHEL, Areva, Siemens and Sterlite have joined hands with PowerGrid to establish the 1,200kV test station. The test line in Bina is being constructed with two 1200kV test bays in which the leading manufacturers are providing main equipment such as transformers, surge arresters, circuit breakers, transformers among others. These test bays and test lines shall be used for various field trials initially. “This will usher a new phase in the transmission sector as with a limited right of way (RoW), bulk power will be evacuated from the point of generation to the load centre. The transmission capacity, thus, will be fulfilled with one such line only catering to the capacity of several generators,” PowerGrid Chairman and Managing Director S K Chaturvedi told Business Standard.
According to IEEMA, the first 1,200kV system field was tested and commissioned in the former Soviet Union in 1985 after 12 years of research, which was discontinued after the disintegration of the Union. Then, Japan started developing a 1,000kV UHV system in 1978 and tests are still on. China started developmental work on a 1,100 kV UHV system in 2005 and a pilot project is presently under testing.
IEEMA’s Senior Director Operations Anil Nagrani said, “This will be an experimental line. There are many advantages of setting up a 1,200 Kv line. With unavailability of RoW, space crunch and various environmental issues, the existing power network can be upgraded to 1,200 Kv lines within the same space or little higher space.”
1IEC 61850, 8:30 X9: This message was deleted
1IEC 61850, 8:37 XXX50: All ok
1IEC 61850, 9:15 X9: Can anyone help me for DIGSI 5
1IEC 61850, 9:21 X9: I’m going to initialise 7SJ85 but it’s firmware version is different…so anybody can help me out for how to update Relay’s firmware so I can initiate with newer configuration
1IEC 61850, 9:23 RR5: Which firmware ver your relay
1IEC 61850, 9:23 X9: My relay have 8.03 and my software configuration have 8.30
1IEC 61850, 9:15 X2: What is p2cc gsm module communications?
IEC 61850, 7:14 zz1: Here I have one confusion or u can say one question related to LT motor protection relay (LS relay)
IEC 61850, 7:15 zz1: In the relay they give def setting and it’s Operation time is 0-30
Now if I select 30 as a operation time
And for over current my setting is 78A at 5 sec
IEC 61850, 7:15 zz1: So when the relay will trip?
IEC 61850, 7:48 XX8: Relay shall trip while motor load current arrives at 78 Amps for the duration of 5 second .
( 0-30 sec . is the range ).
IEC 61850, 7:49 XX8: This message was deleted
IEC 61850, 7:49 zz1: Yes please
IEC 61850, 7:49 zz1: Because I have select 5 sec TMS and also in def setting I select 30 for operation time of dft
IEC 61850, 7:50 zz1: What is the difference between these 2
IEC 61850, 7:51 XX8: Mohil ,
TMS – 5 sec is the relay operation time for the maximum load current
IEC 61850, 7:51 zz1: Then also I select 30 in def operation time
IEC 61850, 7:52 zz1: What was that?
IEC 61850, 7:52 XX8: That’s the maximum range available
IEC 61850, 7:52 XX8: What’s the rating of the motor ?
IEC 61850, 7:54 zz1: Yes but in this I select 30
IEC 61850, 7:54 zz1: So what does it mean
IEC 61850, 7:54 zz1: What will be happened
IEC 61850, 7:54 zz1: Flc 82
IEC 61850, 7:54 zz1: Oc setting is 78A
IEC 61850, 7:55 XX8: This message was deleted
IEC 61850, 7:55 XX8: Would you Please consult your relay manual for abbreviations.
IEC 61850, 7:56 zz1: Ok
IEC 61850, 7:56 XX8: Please carry out the relay setting calculation ist and then set the relays
IEC 61850, 2:56 X2: Can we make custom virtual inputs and outputs signal in Micom PSL?
IEC 61850, 2:57 X2: Lets say i want to configure a signal on LED which is not available in virtual outputs directory,
IEC 61850, 3:15 XX: cant understand
IEC 61850, 3:16 X2: Lets say i want to configure binary input signal of Auto recloser initiation from Distance Relay to a LED
IEC 61850, 3:18 X2: Just to know if dist relay has sent intiation signal to auto recloser or not
IEC 61850, 3:19 X2: I think i can map binary input signal directly to led
IEC 61850, 3:20 X2: <Media omitted>
IEC 61850, 3:36 XX: What the good reason behind setting of 78 Amps ?
IEC 61850, 3:37 XX: While flc is 82 Amps ?
IEC 61850, 3:58 zz1: Nothing
IEC 61850, 5:46 XX: Mohil,
Would you Please discuss this calculation with Sridhar .
Overload setting shall be set in to minimum 110 percent to 125 percent over motor full load current .
PSM & TSM need to be calculated separately properly to evaluate correct setting of Current and Time .
IEC 61850, 5:53 X2: Can any one suggest which logical node need to use for protection setting change in P142 Schneider relay
IEC 61850, 5:58 X2: It is very much appreciated if some one share this urgently
IEC 61850, 6:38 X2: Dear team,
I want digsi – 4 setup so kindly share me 🙏
IEC 61850, 6:38 X2: To this mail id Aravindvin04@gmail.com
IEC 61850, 6:47 XXXX: https://support.industry.siemens.com/cs/document/109740980/digsi-4-v4-93-full-version-device-drivers-(without-license-key-usable-as-30-days-trial-version)?dti=0&lc=en-WW
IEC 61850, 6:48 XXXX: Digsi 4👆🏾
IEC 61850, 6:49 X2: Actually i need now sir thats y i asked through mail.. anyway thank you ill register it.
IEC 61850, 6:49 X2: 🤝🏼
IEC 61850, 6:49 X2: Thank you so much for your prompt response. 🤝
IEC 61850, 7:01 X2: @923458092813 :Do you have Any idea on this logical node?
IEC 61850, 7:03 XX: Hi Engr. Ruver, Can I get Digsi 5 for siprotec 5 devices
IEC 61850, 7:12 X2: No dear
IEC 61850, 7:12 X2: I have recently started working on micom relays…
IEC 61850, 7:12 X2: Oh okay.No issues .thank you
IEC 61850, 7:13 X2: 👍
IEC 61850, 8:11 XXXX: https://support.industry.siemens.com/cs/document/109767686/digsi-5-v8-00-(trial-update-full-version)?dti=0&lc=en-WW
IEC 61850, 8:11 XXXX: Digsi 5 👆🏾
IEC 61850, 8:12 XXXX: the file is too big to send in email!!
IEC 61850, 8:19 XX: Is it trial or full version??
IEC 61850, 8:19 XX: It’s ok
IEC 61850, 8:46 zz1: Siemens siprotec 4&5 both needs license..but I can get 30 days trial version..but after 30 days you’ll need a license for it
IEC 61850, 8:47 zz1: Digsi 4-&-5
IEC 61850, 8:48 XX: No any pirated or cracked version in Digsi 5
IEC 61850, 8:49 zz1: I never found anywhere pirated copy of digsi software
IEC 61850, 8:55 XX: 😏😏
1IEC 61850, 9:22 XX: <Media omitted>
1IEC 61850, 9:22 XX: I cannot communicate digsi -4 relay
1IEC 61850, 9:22 XX: This pop up message coming
1IEC 61850, 9:22 XX: Can any one please assit me
1IEC 61850, 9:23 X9: Hv a device driver
1IEC 61850, 9:23 XX: Yes i installed
1IEC 61850, 9:23 XX: 7sj80x series only i installed
1IEC 61850, 9:24 XX: Even after it is coming
1IEC 61850, 9:24 X9: You path is showing empty
1IEC 61850, 9:24 XX: So what i have to do sir
1IEC 61850, 9:24 X9: Reinstall and then try..and first check firmware version in relay which u want to communicate
1IEC 61850, 9:25 X7: You need data model for this relay
1IEC 61850, 9:25 XX: How to check that sir?
1IEC 61850, 9:26 XX: <Media omitted>
1IEC 61850, 9:28 XX: Actually i want to change the CT ration. I tried through hmi i can’t so install software but i cant communicate
1IEC 61850, 9:28 XX: Ct ratio*
1IEC 61850, 9:29 zz1: from setup and extra
1IEC 61850, 9:29 XX: If i want change the ct ratio through HMI. What i have to do. I tried but it shows cant be change.
1IEC 61850, 9:30 XX: From SIOS only
1IEC 61850, 9:30 zz1: but you need to change at two place
1IEC 61850, 9:30 XX: How to do sir?
1IEC 61850, 9:30 zz1: which is only possible through software
1IEC 61850, 9:31 XX: Yes thats y i installed but cant communicate. Thats the problem
1IEC 61850, 9:32 zz1: whats problem you have to face
1IEC 61850, 9:32 zz1: and whats the shows on window when you communicate
1IEC 61850, 9:33 X9: Can u show us your device driver library in digsi
1IEC 61850, 9:34 X9: Checkout is there ur device installed or not
1IEC 61850, 9:34 zz1: Go to setting menu >>setup and extra>>MLFB version There you can find firmware and p set version
1IEC 61850, 9:37 zz1: This could be find on relay display only for in your PC plz open digsi creat a folder>>right clik any where on window>> first option is divce catlog select it then go to opne popup here u can able to see all relay modal select the corresponding model and check whether the required p set version install or not.
1IEC 61850, 10:11 XX: Okay
1IEC 61850, 10:11 XX: Let me check
1IEC 61850, 10:16 XX: Okay sir let me check
1IEC 61850, 10:27 XX: <Media omitted>
1IEC 61850, 1:35 XXXX: Hi Boss, you have install the device drive of relay in digsi.
1IEC 61850, 1:35 XXXX: https://support.industry.siemens.com/cs/document/109742699/siprotec-compact-7sj80-device-driver?dti=0&pnid=25318&lc=en-WW
1IEC 61850, 1:35 XXXX: Send link👆🏾
1IEC 61850, 1:36 X2: Yes
1IEC 61850, 1:36 X2: I have installed and updated firware version also
1IEC 61850, 1:36 XX: Please ho to fix communication problème ref542plus
1IEC 61850, 1:37 X2: Now its communicating successfully
1IEC 61850, 1:37 X2: Thank you i have done
1IEC 61850, 1:37 XXXX: 👏🏾👏🏾
1IEC 61850, 1:38 X2: And i have one more doubt. Relay is not showing the fault in hmi for that what i have to do
1IEC 61850, 1:39 XXXX: have to configure the leds
1IEC 61850, 1:40 XXXX: in the matrix
1IEC 61850, 1:44 X2: Okay sir i ll do that and check
1IEC 61850, 1:45 X2: Led is coming sir
1IEC 61850, 1:46 X2: In display am asking.. like over current operated should come rite but in this relay is not coming
1IEC 61850, 1:46 X2: Okay let me check
1IEC 61850, 5:25 X2: This message was deleted
1IEC 61850, 5:26 X2: This message was deleted
1IEC 61850, 5:26 X2: Any one know how to configure no.start for hot and cold in Easergy P3M30 Schneider relay?
1IEC 61850, 5:29 X9: https://www.se.com/ww/en/product/REL52502/p3m30%2C-motor-protection-relay/
1IEC 61850, 5:31 X2: <Media omitted>
1IEC 61850, 5:32 X2: Yes I know the site to reach to get the manual. As per the above setting, direct hot or cold assignment is not available same like micom
1IEC 61850, 5:33 X2: Can anyone suggest is is possible to set this cold and hot numbers in P3M30?
1IEC 61850, 6:46 XX: Hiiii any one help what is dlms mean
1IEC 61850, 6:46 XX: Delms means
1IEC 61850, 6:50 PMX5: Cold star 2 , Hot star 1 allowable it’s thumb rule….. Kindly refer motor manufacture data sheet….
1IEC 61850, 6:52 XX: Please help me what is dlms means
1IEC 61850, 6:53 PMX5: https://www.dlms.com/
1IEC 61850, 6:53 PMX5: Dlms used in Special energy Meter one type file system
1IEC 61850, 6:55 PMX5: <Media omitted>
1IEC 61850, 6:56 PMX5: Device language message specification
1IEC 61850, 6:56 X2: Is there any settings available in P3M..I can’t see that
1IEC 61850, 6:56 X2: Micom it is available to set
1IEC 61850, 6:57 PMX5: Relay Manufature
1IEC 61850, 6:58 PMX5: And relay model no kindly furnish here
1IEC 61850, 6:58 X2: Easergy P3M30 SCHNEIDER
1IEC 61850, 6:59 PMX5: Ok
1IEC 61850, 9:28 X2: How does TCS relay monitor the healthiness of Trip circuit?
1IEC 61850, 9:29 X2: is it monitor the negative supply by using NO and NC contacts when CB is open or closed?
1IEC 61850, 10:17 XX: Yes , through circuit breaker both contacts ( NO and NC contacts ) . TCS – trio coil supervision is very important feature of monitoring trip coil healthiness .
1IEC 61850, 11:41 X2: 👍🏻
1IEC 61850, 12:19 PM X5: <Media omitted>
1IEC 61850, 12:19 PM X5: <Media omitted>
1IEC 61850, 12:19 PM X5: <Media omitted>
1IEC 61850, 12:19 PM X5: <Media omitted>
1IEC 61850, 12:19 PM X5: <Media omitted>
1IEC 61850, 2:32 X2: Can we operate brekaer mechanism if its coupler is not attached with CB ploe plunger
1IEC 61850, 2:34 PM X5: No
1IEC 61850, 2:34 X2: Can u state the reason
1IEC 61850, 3:49 XX: Bro , Can anyone help me to evaluate – what are the inputs required for Harmonic Study of the Power system ?
1IEC 61850, 3:50 XX: Dear Sridhar & others ,
Would you mind to help me out of this harmonic study please ?
1IEC 61850, 6:32 X5: Refer IEEE 519
1IEC 61850, 5:56 X5: This message was deleted
1IEC 61850, 11:19 XXX50: Our 600MVA tranformer tripped on energization on tertiary earth fault relay… There is a 2000A cutrent in neutral
1IEC 61850, 11:21 XXX50: There is no fault on transformer. Everything is ok… Soon after performing various transformer tests whrn we try to energize it trips
1IEC 61850, 11:23 AM X5: Tertiary is delta?Primary 400 kV?400/220/33 kV xmer?
1IEC 61850, 11:29 XXX50: 500/220/23kV
1IEC 61850, 11:29 XXX50: Yes tertiary is delta
1IEC 61850, 11:30 X5: Switching angle? On PoW?
1IEC 61850, 11:32 XXX50: We dont have switch synch relay for oir transformer
1IEC 61850, 11:33 XXX50: I think its due to core Magnetization because of applying dc voltages to the tx winding during winding resistance test
1IEC 61850, 11:33 X5: Can u send relay DR
1IEC 61850, 11:34 XXX50: Give me a minute
1IEC 61850, 1:14 X2: Good day..Any one tested VAIO12AD RTD with Easergy P3 relay?
1IEC 61850, 2:19 X2 changed their phone number to a new number. Tap to message or add the new number.
1IEC 61850, 3:14 X5: Need to be grounded on each phase to make sure that there is no high remanence dc current
1IEC 61850, 3:19 X2: 👍🏻
1IEC 61850, 3:55 XXXX: Was the fault oscillogram generated? can you send us?
1IEC 61850, 4:37 PM – AA 8860 Abu Jahad changed their phone number to a new number. Tap to message or add the new number.
1IEC 61850, 9:29 X2: <Media omitted>
1IEC 61850, 9:29 X2: <Media omitted>
1IEC 61850, 9:29 X2: <Media omitted>
1IEC 61850, 9:29 X2: Shared above
1IEC 61850, 5:14 X5: CT is saturating during energization…. Just check I2/I1 is enabled….
1IEC 61850, 6:50 zz1: <Media omitted>
1IEC 61850, 6:52 zz1: <Media omitted>
1IEC 61850, 7:05 X5: What is the sign of this case in the Disturb. Record ?
1IEC 61850, 7:29 XX8: CT should not be energised until and unless there is external fault already existing .
Let us know I2/I1 ratio ?
1IEC 61850, 7:30 XX8: Saturation actually take place place due to DC component of the the through fault current .
1IEC 61850, 7:30 XX8: Let us know your response please
1IEC 61850, 8:00 XXX50: 15%
1IEC 61850, 8:01 XXX50: This was due to inrush current at the time of energization of Transformer
1IEC 61850, 8:17 X7: How to test rotor Earth fault protection
1IEC 61850, 8:17 X7: Plss tell me it’s urgent
1IEC 61850, 9:03 XX8: Second harmonic restraint should mini minimise Magnetic inrush ? Is it not ?
If I am wrong , correct me ?
1IEC 61850, 9:19 XXX50: No its not like that… 2nd harmonics produced during inrush current for Magnetization of core
1IEC 61850, 11:15 XX8: Ok
1IEC 61850, 11:17 XX8: Then for what else inrush current comes in to picture ?
1IEC 61850, 12:48 zz1: Anyone have siprotec 5..7SJ85 Relay LED strip format in word
1IEC 61850, 1:51 XX: Hiii sir any one help.. Any profuct is there rs485 to IEC61850 convertor
1IEC 61850, 2:15 PM – AA 8135 Amar S: Hi ,
Just wanted information what are the main causes buczzlozes trip.
1IEC 61850, 2:19 X2: When we energize TF there is hevay inrush current to magnetize tf core
1IEC 61850, 2:38 X2: How to demagnetize 3 winding tranformer using AC voltage?
1IEC 61850, 3:39 PM X5: This message was deleted
1IEC 61850, 3:54 X2: Didn’t understand it
1IEC 61850, 3:57 PM X5: <Media omitted>
1IEC 61850, 4:00 X2: I want to know how to do it practically on 3 winding TF
1IEC 61850, 4:02 X2: We have tested 600MVA TF Blue phase, if we try energize it after testing, tue tertiary earth fault relay trips on high neutral current
1IEC 61850, 4:02 X2: 3000 ampere current from tertiary neutral
1IEC 61850, 4:03 X2: If we try to energize 2nd time after tripping then there is no issue
1IEC 61850, 4:03 X5: Sorry 🙏
1IEC 61850, 4:08 X5: How could the 3kA be in TF tertiary neutral ?
1IEC 61850, 4:59 XX: Yes , I know that’s due to residual magnetism ( which can be minimised by proper design of the transformer core ).
1IEC 61850, 5:00 XX: Thats good constructive discussion, which is the purpose of the group .
1IEC 61850, 5:04 XX: https://www.electronics-tutorials.ws/electromagnetism/magnetic-hysteresis.html
1IEC 61850, 5:08 XX: Then why we use second harmonic restraint feature in transformer multifunction relays ?
1IEC 61850, 5:09 XX: What’s the good the good reason of using this feature ?
1IEC 61850, 5:15 X2: Inrush current flows during energization
1IEC 61850, 5:16 X2: And 2nd harmonics is also produced along with normal current
1IEC 61850, 5:24 x45: Very good!
1IEC 61850, 5:29 XX: Thanks ,
This is the purpose of this group .
1IEC 61850, 6:09 PM IEC: Kindly send.. REL 511 relay setting xls file..
1IEC 61850, 6:41 PM – +57 300 3957271 left
1IEC 61850, 4:47 X2: Hi, can anyone share info about how lightning arrester’s mA meter and counter operates? Thanks in advance.
1IEC 61850, 5:05 XX: Anyone know the nps thermal in p345 relay set and reset time formula
1IEC 61850, 11:59 KK: <Media omitted>
1IEC 61850, 4:02 AM X6: <Media omitted>
1IEC 61850, 4:03 AM X6: Pick up threshold current and dropout threshold %
1IEC 61850, 4:03 AM X6: Check this formula
1IEC 61850, 4:05 AM X6: <Media omitted>
1IEC 61850, 4:05 AM X6: Check this one too
1IEC 61850, 4:18 AM X6: Formula
(240% x 1.06×10/100)x100%=
25.44% approx 26%
1IEC 61850, 4:18 X6: This message was deleted
1IEC 61850, 4:22 X6: IL1 = 26 %
1IEC 61850, 5:08 KK3: why IL1 and IL2 are shown separately
1IEC 61850, 5:12 X6: <Media omitted>
1IEC 61850, 5:15 X6: <Media omitted>
1IEC 61850, 5:17 X6: IL1 = ANSI 50 51 N ; IL2= ANSI 79
1IEC 61850, 5:18 KK: pls describe this formula
1IEC 61850, 5:18 XXX52: https://new.siemens.com/global/en/products/energy/energy-automation-and-smart-grid/webinars.html#Registration
1IEC 61850, 5:24 X6: I pick thres= 1.06 x Ipickup
1IEC 61850, 5:25 X6: Ipickup= 10%
1IEC 61850, 5:27 X6: IN= I pick thres
1IEC 61850, 5:31 X6: %IL = (240% X I pick thres)x 100 %
1IEC 61850, 5:36 KK3: pls share this docoument. i did not get clearly
1IEC 61850, 5:39 X6: <Media omitted>
1IEC 61850, 5:48 KK3: thanku
1IEC 61850, 6:00 X6: welcome
1IEC 61850, 6:04 X5: https://ieeexplore.ieee.org/document/9231065
1IEC 61850, 6:04 AM X5: My IEEE research paper
1IEC 61850, 10:05 XXX52: https://new.siemens.com/global/en/products/energy/energy-automation-and-smart-grid/webinars/expert-workshop-process-bus-20201104-10am-cet.html
1IEC 61850, 1:43 X2: Can any one share P343 Schneider test procedure
1IEC 61850, 3:03 ee4: This message was deleted
1IEC 61850, 3:03 ee4: This message was deleted
1IEC 61850, 3:04 ee4: This message was deleted
1IEC 61850, 3:09 ee4: <Media omitted>
1IEC 61850, 3:10 ee4: <Media omitted>
1IEC 61850, 3:12 XX: How to calculate single phase pickup for trafo differential?
1IEC 61850, 3:17 PMX5: Relay Manufature and type of TX configuration required
1IEC 61850, 3:36 XX: This message was deleted
1IEC 61850, 3:37 X24: What is the legend of K M E?
1IEC 61850, 3:42 XX: M- means mechanical interlock ,
E- means electrical interlock
1IEC 61850, 3:43 X24: K?
1IEC 61850, 3:44 XX: K- means Key Exchange Box interlock
1IEC 61850, 3:44 X24: Well..
1IEC 61850, 3:44 XX: Hope , this clarifies your doubt
1IEC 61850, 3:44 XX: Is it ok 👍 now ?
1IEC 61850, 3:49 X24: For example and simplify,
When Q9 Open position, there have Electric Interlock.
When Q1 closed position, there have Electric Interlock.
When 57BBA Open position, there have mechanical interlock.
Have to unlock to swiching the position.
1IEC 61850, 3:49 X24: Yes
1IEC 61850, 3:51 XX: 1). This is interlock between line disccconector and line cucuit breaker .
This Disconnector can be closed only while CB is open and can be opened only while CB is closed .
These disconnectors are the three position switches .
2). Moreover , Q51 , Q52, Q6 & Q8 are the earthing switches .
If these are closed , you can not close the CB .
1IEC 61850, 4:13 XX: Tx configuration means?
1IEC 61850, 4:15 PMX5: Star delta??? Star star???? Delta delta????
1IEC 61850, 4:15 PMX5: Which one????
1IEC 61850, 4:16 XX: Yd11
1IEC 61850, 4:16 PMX5: Relay Manufature????
1IEC 61850, 4:16 XX: Alstom
1IEC 61850, 4:16 PMX5: CT ratio
1IEC 61850, 4:16 PMX5: TX rating
1IEC 61850, 4:16 XX: 1000/1
1IEC 61850, 4:16 XX: 600MVA
1IEC 61850, 4:17 PMX5: Ok Alstom which plate form relay
1IEC 61850, 4:17 PMX5: ???
1IEC 61850, 4:17 PMX5: Ok
1IEC 61850, 4:17 PMX5: 643 ???
1IEC 61850, 4:18 PMX5: CTR both side same????
1IEC 61850, 4:18 XX: Same
1IEC 61850, 4:18 XX: Yes
1IEC 61850, 4:18 PMX5: Differential setting
1IEC 61850, 4:18 PMX5: ????
1IEC 61850, 4:19 PMX5: How much
1IEC 61850, 4:19 XX: 0.2 PU
1IEC 61850, 4:19 PMX5: One more kindly check ctr???
1IEC 61850, 4:20 PMX5: % impedance TX
1IEC 61850, 4:21 PMX5: ????
1IEC 61850, 4:21 XX: Not available
1IEC 61850, 4:21 PMX5: Voltage ratio
1IEC 61850, 4:22 PMX5: Both primary and secondary
1IEC 61850, 4:22 PMX5: ???
1IEC 61850, 4:22 XX: 220/132kv
1IEC 61850, 5:27 PM X5: @966544241843 did you saw the current waveform?? In disturbance record?
1IEC 61850, 5:31 PM X5: During energization…. primary side of transformer faces a huge current & secondary doesn’t in case of open secondary . Why??
This huge inrush causes CT to saturate. Therefore ratio of Secon order current to Nominal is taken to detect difference between inrush & fault.
1IEC 61850, 5:33 PM X5: It is difficult to type & explain without picture. Refer PS Bhimbhra
1IEC 61850, 5:35 PM X5: We need POW Device…. Generally very difficult. Because we don’t know angle of switching
1IEC 61850, 6:14 XX: This is magnetising component only ( for producing flux around the core ) during the no load condition , which is very high inrush due to Residual Flux .
1IEC 61850, 6:15 XX: Sridhar , Not Really .
1IEC 61850, 6:17 X2: Hi any one can share sepam M87 slope test xl or procedure?
1IEC 61850, 7:23 X2: Please send me group link
1IEC 61850, 8:07 X2: Anyone have software for Toshiba GRZ100 distance relay
1IEC 61850, 8:14 XX: Sridhar , you can throw more light on this ,
1IEC 61850, 8:17 PM X5: Kindly see the distorted waveform
1IEC 61850, 8:18 X2: Please also help for this Gr-tiems software
11/4/20, 8:27 fx2: <Media omitted>
11/4/20, 8:36 fx2: doble F6150 power system sim kit.what happan.What issued kit also not working..Anyone ask how to rectif..this problem
11/4/20, 8:59 X2: Why is it showing -5 V? Think
1IEC 61850, 11:08 xxxx1: This kit also not working…
1IEC 61850, 11:09 xxxx1: why it show in Input and output -5 v.
1IEC 61850, 1:25 PM – AA 8720 Vinay left
1IEC 61850, 1:37 XXX50: <Media omitted>
1IEC 61850, 1:38 XXX50: Can anayone explain what is the purpose of start point other than directionality?
1IEC 61850, 1:39 XXX50: And why mostly star point is made on S2 core of CT
1IEC 61850, 1:53 AM X6: S2 means secondary core phase sequence R-B–Y so Y is second therefore star point made on second core of CT
1IEC 61850, 1:56 AM X6: Purpose of star to distribute the supply to other consumer for this reason neutral is also used for grounding
1IEC 61850, 9:38 x45: For safety purpose, the neutral is grounded
1IEC 61850, 9:54 AM X6: Yeah it’s the prime reason but we can’t distribute supply in delta to the consumers
1IEC 61850, 9:55 AM X6: Where do we use star without ground?
1IEC 61850, 9:06j1″: Guys, Please tell me about Synchro-Check(25) relay… How to synchronise two incomer & one bus coupler voltage?? Please tell me settings of Synchro-Check relay(25)…
1IEC 61850, 11:35 X2: For HSAR , disturbance time smaller than 50 ms and distance or feeder differential, fault clearance time smaller than 100 ms. For typical HSAR dead time bw 0.3 to 0.5 sec. Caution: when a specific feeder opens, after fault clearance keep the feeder open. This is DAR; Delayed Autoreclosing. Typical 11/33 kV 1st dead time= 5-10 sec.
2nd dead time= 30 sec.3rd dead time= 60-180 secn 4th dead time = 1 to 30 mins.
1IEC 61850, 11:42KK: what is HSAR
1IEC 61850, 11:47 X2: High speed auto re closing of feeder for Preventing loss of synchronism is High Speed Auto Reclosing of feeder.
11/7/20, 3:38 AM X5: 👍👍
11/7/20, 5:51 x7: Sir, Please tell me Dead time of 33/6.6kV
11/7/20, 6:38 x7: This message was deleted
11/7/20, 8:05 AM X6: Formula for dead time
T = 10.5 + kV / 34.5 cycles
11/7/20, 8:06 AM X6: Put your desired value
11/7/20, 8:10 x7: Thank you sir
11/7/20, 8:20 AM X6: You’re welcome.😇👍
11/8/20, 7:44 AMX4: Anybody have knowledge of MATLAB here?
11/8/20, 7:51 AM X5: What is it about ?
11/8/20, 8:05 AMX4: My friend needs your help
11/8/20, 8:08 AMX4: <Media omitted>
11/8/20, 8:08 AMX4: <Media omitted>
11/8/20, 8:08 AMX4: Need to solve this
11/8/20, 8:30 AMX4: Can you support us sir?
11/8/20, 8:53 AM X5: A bit hard for me to solve your program in Matlab due to my field knowledge is simulink in matlab
11/8/20, 8:56 AMX4: By the word “can” I am not questioning your ability. I Wanted to know your willingness to help. I am requesting your help my dear friend…Is it okay with you?
11/8/20, 8:57 AMX4: Any helping step is appreciated
11/8/20, 5:57 PMX4: I am yet to get support on it!!!
11/8/20, 8:16 XX: How to test crossblocking in ret670 relay
11/8/20, 8:16 XX: What is cross blocking concept
11/8/20, 8:17 XX: And how ret 670 relay calculate diff and bias current for differential
11/8/20, 8:17 XX: How to test
11/8/20, 8:17 XX: Any one plss explain
11/8/20, 8:31 XX: Harmonic cross blocking is whereby whenever the relay detects harmonics in any of the phases differential protection is blocked for all the phases including the phases where harmonics had not been detected.
11/8/20, 8:31 X2: What is cross trip scheme?
11/8/20, 9:03 XX: As I understand that it is inter trip scheme ( transfer trip scheme ) .
11/8/20, 9:08 XX: Normally , for VFDs , where harmonics are kept within 5 percent , even then differential protections are not provided for isolation transformers and MV motors .
11/8/20, 9:45 X2: 👍🏻
1IEC 61850, 6:48 X7: Tq
1IEC 61850, 8:36 XX: Anybody can help me how to configure modbus device ID in secure premier 300 meter.
1IEC 61850, 9:04 AM – X8: Default I’d 1
1IEC 61850, 9:09 XXX5: What do you think about the future of Power sector job in India.
1IEC 61850, 10:54 XXX50: <Media omitted>
1IEC 61850, 10:54 XXX50: Can anyone please describe the function of above devive installed in line CVT MK panel. A
1IEC 61850, 11:12 XX8: I was outside India for more than decades , hence power investors can suggest better than anyone else .
1IEC 61850, 6:49 oo0: Photo is not clear.. Could take it again
IEC 61850, 8:11 PM – You added J 1000 Kk 1330 Intr
11/10/20, 10:39 XXX50: Its a No Voltage device and used for interlocking of shunt reactor… I dont know how its work
11/10/20, 11:48 x45: For closing the line earth swit h the under voltage relay is used… In interlocking circuit
11/10/20, 11:48 XXX50: Can you tell me more about it
11/10/20, 11:48 XXX50: What’s the reason behind it
11/10/20, 12:41 oo0: In order to open Or close the line earth switch the line voltage should be less than 15percent of nominal value
11/10/20, 12:42 oo0: This is to ensure that the line is not closed Or opened in the live condition
11/10/20, 12:42 oo0: This is to ensure that the line earthswitch is not opened Or deleted in the live condition
11/10/20, 12:42 X2: Nice
11/10/20, 12:43 X2: Got it
11/10/20, 12:44 X2: You mean if line voltage or greater than 15 percent then under voltage relay will prevent the operation of earth swith… Right.?
11/10/20, 12:57 oo0: Yes
11/10/20, 12:57 X2: 👍🏻
11/10/20, 3:06 XX: If it’s less than 80% rated voltage then it’s dead bus .
From Live bus to Dead line charging is also possible by bypassing Check- Sych relays .
11/11/20, 10:23 XXX50: Can anayone share the implented drawing of Bay controlller unit… I haven’t worked on bay control unit and wanted to know the scheme
11/11/20, 11:14 AM X6: How to bypass breaker??
11/11/20, 11:14 ppi: Please provide international standards for power transformer testings
11/11/20, 11:14 ppi: <Media omitted>
11/11/20, 11:15 ppi: <Media omitted>
11/11/20, 11:15 ppi: Like I have share some IEC
11/11/20, 11:16 XX8: You need to bypass the the interlock , but this shall be reinstated asap . As isolator is a no load switching-device
11/11/20, 11:22 XX8: BCU is built up of two part two parts 1). Mosaic Tiles with Hardware Mimimic 2). Control ( with Discrepancy Switches ) and Feeder Protection Relays.
Please refer to the ABB & Siemens websites for EHV BCU details, control and Relay details along with BCU layouts .
11/11/20, 11:23 XX8: Please study the schematic drawings of vendors throughly and then you will understand.
11/11/20, 11:24 XXX50: 👍🏻
11/11/20, 4:35 XX: <Media omitted>
11/11/20, 4:53 XX: Fuqram , u can refer to above
11/11/20, 4:54 X2: 👍🏻
11/11/20, 5:30 XX: <Media omitted>
11/11/20, 5:44 XX: 🤝👍
11/11/20, 5:44 XX: 🤝👍
11/11/20, 5:45 XX: 👍
11/12/20, 6:51 XX: Pls share end section 1 & 2 calculation of RET670 relay
11/12/20, 7:01 AM – AA 8089: This message was deleted
11/12/20, 7:02 AM – AA 8089: This message was deleted
11/12/20, 10:08 AM X6: Anyone knows the manufacturer of split-core (Slip-over) type CBCT??
11/12/20, 10:34 AM – You added J 1000 8465 Bhavan Sir SPEC
11/12/20, 12:08 X5: 👍🏻👍🏻
11/12/20, 10:55 XX: Please i need ct saturation test using cpc 100
1IEC 61850, 4:40 XX8: Please arrive at the point of BH curve where current increases by 50 percent for voltage increment of only 10 percent , that’s the knee point .
And then find out CT saturation.
1IEC 61850, 4:48 XX8: Increase voltage and current up to the the knee point and then follow the process as above .
1IEC 61850, 6:48 XX80: R-Y =15 M ohms Y-B = 14 M ohms B-R = 10 M ohms R-E= 8 M ohms Y-E = 10 M ohms B-E= 10 M ohms
1IEC 61850, 6:49 XX80: 11kv ABC conductor
1IEC 61850, 6:53 XX80: How can possible Megger are coming
But when we discharge conductor with ground only one phase discharge Remaining two phase not charge..
1IEC 61850, 1:39 XX: <Media omitted>
1IEC 61850, 1:55 X2: The circuit look like 3 VTs in series
1IEC 61850, 1:56 X2: This message was deleted
1IEC 61850, 1:56 XX: Yes but why they use it
1IEC 61850, 1:58 X2: Delta connection
1IEC 61850, 1:58 XX: <Media omitted>
1IEC 61850, 1:59 XX: Yes delta
1IEC 61850, 1:59 XX: <Media omitted>
1IEC 61850, 2:00 X2: Send clear pic
1IEC 61850, 2:02 XX: <Media omitted>
1IEC 61850, 2:03 X2: Are u asking for resistance?
1IEC 61850, 2:04 XX: Yes for résistance
1IEC 61850, 2:08 X2: Load having resistive in nature.
1IEC 61850, 2:09 X2: Limiting value
1IEC 61850, 2:09 XX: MV motors and transformers
1IEC 61850, 2:10 X2: Whatever the type of load you connect must have the assigned value which has mentioned by you in red colour?
1IEC 61850, 2:11 X2: Good day to all .Any one have document to do auto DR In micom Px4x relays
1IEC 61850, 2:12 X2: Automation DR thr ftp
1IEC 61850, 2:15 XX: This is connection delta is only for incommer and busbar measuring
1IEC 61850, 2:16 X2: Yeah clarify by referred drawings
1IEC 61850, 2:17 X2: Check furell
1IEC 61850, 2:18 XX: What check could you précise
1IEC 61850, 2:19 X2: Drawing of incomer
1IEC 61850, 2:19 X2: Drawing of bus section
1IEC 61850, 2:20 X2: The drawing you shown only for voltage measurement
1IEC 61850, 2:20 XX: <Media omitted>
1IEC 61850, 2:20 XX: This is incomer
1IEC 61850, 2:21 X2: Then it is metrocil
1IEC 61850, 2:22 XX: ??
1IEC 61850, 2:23 X2: Resistance metrocil
1IEC 61850, 2:23 XX: Thank you very much
1IEC 61850, 2:23 X2: Have you got my point?
1IEC 61850, 2:26 X2: <Media omitted>
1IEC 61850, 2:27 XX: Yes its non linear résistance correct?
1IEC 61850, 2:29 X2: <Media omitted>
1IEC 61850, 2:30 X2: Varistor
1IEC 61850, 2:30 XX: Thanks a lot
1IEC 61850, 7:26 XX: <Media omitted>
1IEC 61850, 7:26 XX: <Media omitted>
1IEC 61850, 11:36 XX: This is damping resistor not metrosil my friend
1IEC 61850, 12:09 AM X6: Metrocil
1IEC 61850, 12:10 X7: Damping resistor for vt protection
1IEC 61850, 12:11 AM X6: Metrocil is a variable resistor dear
1IEC 61850, 12:12 AM X6: Metrosil offers a wide range of high energy silicon carbide varistors. These non-linear resistors provide surge protection for prestigious infrastructural projects. Our brand name is so well known, it is often used as a generic term for a varistor
1IEC 61850, 12:12 X7: Ys but metrosil for ct or bb protection not this case is balast resistor to protect Vt for feroresanance
1IEC 61850, 12:13 AM X6: Its has multipurpose application for protective devices
1IEC 61850, 12:14 AM X6: It depends for which protection are you applying
1IEC 61850, 12:14 X7: Ok dear thanks for clarification
1IEC 61850, 12:14 AM X6: It may be CT VT BB
1IEC 61850, 12:19 AM X6: It creates undamped oscillations in the network when capacitive circuit introduces inductive distortions in the ongoing supply so metrocil damps the undamped oscillation in the circuit avoiding ferroresonance and produces undamped output
1IEC 61850, 12:19 X7: Totamly agreed with you dear.thanks a lot
1IEC 61850, 12:20 AM X6: Ok thanks for the collab
1IEC 61850, 12:21 X7: Thanks for your time and for your prompt response
1IEC 61850, 12:22 AM X6: My pleasure it’s clarification is must
1IEC 61850, 12:22 X7: Thanks we are on the same way
1IEC 61850, 12:22 AM X6: 👍
1IEC 61850, 5:07 X2: Is etap 16 good enough for simulating sequence operation of all protective relays of 500kV substation e.g distance, differential, overcurrent, synch, overvoltage.?
1IEC 61850, 5:12 PM – X3: Hello.
I need recovery password for p441 agile relay.Can you help me?
1IEC 61850, 6:01 PMX5: AAAA
1IEC 61850, 6:08 PM – X3: I’ve tried it but not work.
1IEC 61850, 6:11 PM – X3: I’ve reed a security code on relay and I need a new recovery password.
1IEC 61850, 6:12 PM – X3: Security code is generated for 72 hour.
1IEC 61850, 6:14 PM – X3: Can anyone give me a recovery password from ge company based on security code?
1IEC 61850, 6:18 X2: If you forget password you need contact customer care to get the recovery password with device details with security code
1IEC 61850, 6:19 X2: No one can generate pw outside
1IEC 61850, 6:22 PM – X3: Ge company have baned my location.
1IEC 61850, 6:23 X2: You need to contact local GE
1IEC 61850, 6:23 X2: Customer care is common for everyone one
1IEC 61850, 6:23 PM – X3: My location doesn’t have contact center.
1IEC 61850, 6:25 PM – X3: I’ve tried before but they didn’t help me.
1IEC 61850, 6:25 PM – X3: My location is Iran.
1IEC 61850, 6:39 X2: Iran mainly handling by someother customer care country
1IEC 61850, 6:39 X2: Schneider is handling through Egypt
1IEC 61850, 6:40 X2: May be local GE Service or sales can help
1IEC 61850, 6:42 PM – X3: I think, Ge is handling through Turkey.I have to try.
1IEC 61850, 6:49 PM – X3: Thanks for your help🙏
1IEC 61850, 6:54 X2: 👍
11/15/20, 8:53 bb1: This message was deleted
11/15/20, 9:23 XX8: Super
11/15/20, 2:21 X2: Can any one share micom P14x relay, master trip 86 scheme assignment with psl
11/15/20, 3:11 PM IEC: <Media omitted>
11/15/20, 5:07 XX: Do u have any standards related to Power transformer winding resistance measurement or complete testing standard
11/16/20, 6:50 XX80: <Media omitted>
11/16/20, 6:50 XX80: How to come on main display..
11/16/20, 7:03 X9: Enter…arrow keys.. select clear and enter
11/16/20, 7:06 XX80: Not clear after this steps
11/16/20, 7:06 XX80: Sir
11/16/20, 7:25 XX: I think this led configured for healthy condition
11/16/20, 7:31 BB2: This indicates healthy circuit.
11/16/20, 7:39 XX80: Ok Sir
11/16/20, 7:39 AM – X3: You have a problem in trip circuit,not in relay.
11/16/20, 7:51 AM – X3: If this led has turned off already.
11/16/20, 11:39 XXX50: How to test broken conductor in abb relays?
11/16/20, 11:39 XXX50: <Media omitted>
11/16/20, 11:39 XXX50: Setting is above
11/16/20, 3:02 X2: This message was deleted
11/16/20, 7:59 X24: Thanks, any one hase Standard Guide for relay (Distance, Differential, Over current) testing plz share it.
11/19/20, 9:26 XXX50: How to calculate negative seq current in simple way
11/19/20, 9:27 XXX50: I need to calculate unsymmetrical current condition for broken conductor …. How to manually tune/calculate I2/I1 ratio?
11/19/20, 10:49 AM – kk 1452 Shrawan Shiwarkar left
11/19/20, 11:59 XX: Is it possible to access the Datas of micom relays through ftp method or IP address same like Easergy P3 relays?
11/19/20, 12:00 X2: This message was deleted
11/19/20, 12:00 X2: Did any one try this before?
11/20/20, 6:34 XX80: How to resolve overcurrent in ABB inverter. Please help me My frnds
11/22/20, 11:18 XX: Hi good day.. I need clarification of 33kV RMU and OLU oil BDV test…. acceptance of energization.
If anyone have standards,plz share.
11/22/20, 11:19 xxc: Yes through IP address
11/22/20, 11:23 XX: I mean that same like web brower concept. Can you explain the procedure did before
11/22/20, 11:24 XX: As per my understanding, it is not possible to access only with IP address to access the relay datas
11/22/20, 11:25 xxc: Just go to Micom S1Agile software and connect ur relay through enter IP address of ur relay. I.e 192.254.0.193
11/22/20, 11:26 XX: Just to explain, P3 relays if you know the IP address ,you can access the entire relay parameter
11/22/20, 11:29 XX: You are taking about rear communication. One of my client to know is it possible to extract thr web browser
11/22/20, 11:30 xxc: U can do it through HMI facility in relay if available and for that u need router at ss.
11/23/20, 6:40 x7: What is the WTI and OTI Alarm and Trip settings in India? Please tell me…
11/23/20, 6:44 xxd: Winding Temperature Indicator WTI Alarm -85°C, WTI Trip -95°C
Oil Temperature Indicator OTI Alarm – 95°C, OTI Trip-105°C
11/23/20, 6:45 x7: Thank you sir 🙏
11/23/20, 6:45 vv1 🙏🏻🤝🏻
11/23/20, 6:46 x7: 😊🙏
11/23/20, 7:03 AM X6: What is minus sign -,, purpose