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Sample group discussion:
– Anybody can guide me about zero-sequence current?
– I have only phase CT and residual connection.
– If no CBCT is available then I0 how I can take it in line.
– What equipment, and Model?
– L&t ACB Breaker and mm10 relay.
– You are required to give the settings of measured earth fault protection in the relay, so by residual connection io directly come into line.
Telegram group link Protection Relay Discussion Group: https://t.me/joinchat/Cmyg2FiXX-qlTYqyXQ_pjg
– Anyone knows how to check the capacitor with a multimeter?
– CHECK THE AMPERE ON EACH PHASE IF IT IS HEALTHY IT WILL SHOW AMPERE ON EACH PHASE. RESPECTIVELY IF THE PHASE SHOWS ZERO AMP THEN IT IS DAMAGED.
– Can anyone help to identify, in actuality what the main fault is? It occurred last week.
– master and o/c & E/F fault relay trip. And Simultaneously line Side SF6 breaker trip.
– We have 9 MVA, two power transformers in 66 kV Switchyard Fault occur only on transformer 1 and only line Side SF6 breaker trip, I don’t understand this. Please help.
– O/c & e/f I think backup protection for short circuits or internal faults inside the TR.. check your protection scheme to understand further.
– all I can tell u is, it may be a heavy imbalance in the loading of the line. if it occurs once in a while & goes away please note this & revise your settings through relay coordination.
– Anyone here, who can tell me about solenoids?
– Like this one solenoid.
– Our Switchyard SLD, also in case SF6 breaker out of 3 poles 1 pole does not get close (remains open). Kindly check this out.
– On my site, 33kv ht cable IR values are R= 60 megaohm, Y=1 gigaohm, B =1 gigaohm. Please give suggestions if energies the cable.
– How much voltage was injected into the cable?
– 1000 volt
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– Try to inject 5kv. From my experience, If you got the same value you can charge the cable.
– 60 megaohm is acceptable if I injected 5kv.
– If is it possible to keep the cable in sunlight, then conduct IR you can get better value.
– I had charged the 11kv bus when I got cable IR around 10 M ohm.
– Clean the cable jointing kit perfectly, then means if you find any carbon in the cable termination. IR value can also improve by doing this.
– Around 1km cable laid.
– I Am not saying to clean all the cable. Just clean only the HV Termination kit.
– If it is possible to try to do a route survey also as per standard minimum of 100 megaohms is required?
– Use a blower to heat the termination side it is the sleeve.
– Can anyone tell me the difference between the Hipot test and the IR Test of cables?
– In the Hipot test, we check magnetic earth leakage current. In IR test check cable insulation.
– the procedure in the Hipot test if it’s 11 KV we have to apply 28 kV for 1 minute and measure the leakage current in Milliamps, in the IR test we have to use 5 KV DC Megger and measure the resistance in megaohms
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– Why it is 28kv? why can’t we measure with 5kv?
– The Hipot test formula =80% ((2*rated voltage) +1kv)
– In the formula, it’s not coming 28 kV
– For your understanding, I sent the Hipot test voltage of switchgear as per standard, for differentiating Hipot and IR Test.
– How to increase normal current from 0.4 to. 08 by ABB REJ501 relay?
– Ct ratio 125/1 amps
Now want to change .4 to.8.
– Hi anybody has an idea how to calculate the THDi from my current measurements Without the use of a Multifunction meter?
– Why impedance correction factor is needed for short circuit analysis
– Does anybody use line differential relay 7SD8021? Please share the setting details.
– where this relay is used?
– Please I need a Test Report Format for REU615 as a Synchronization Relay
– Anyone can help, this contactor is not on that’s why my motor not on any possibility
– Underground cable testing procedures.
– Check the coil and auxiliary contacts, check the control supply and main supply
– I working on a 66/33 kV substation plant trip due to the VT fuse failure alarm. How to troubleshoot VT fuse Failure alarm?
– Please check the relay configuration. VT fuse fail should not go for tripping only for alarm needs to be configured.
– Check the fuse may be broken, and I have also faced the same issue.
– Here alarm command parallel-connected master trip relay.
– It should give only a fuse fail alarm, but it should not give tripping signals.
VT fuse failure relay
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– what is the use of short circuit analysis in relay setting calculation of a line or transformer? Why, because line settings are mainly calculated from the line impedance only not on short circuit data & similarly for transformer relay setting also from Transformer MVA and tap settings are mostly needed.
– What is the contribution of short circuit analysis to distance relay & differential relay settings?
– What will you find when visiting a power station, green building, and Fiber optics factory?
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– What are the Commissioning procedures of HV/EHV types of equipment and different types of tests required before and After Energising the new lines/feeders, Transformers/Reactors?
GROUPELEC_ENG.pptx
856: You’re welcome to any request.
Rai: Anyone has Siemens Step 7 smart software?
– Can anyone share the Commissioning and maintenance of the electrical power system by Keith Harker?
– what are the disadvantages of VFD?
it reduces the life of other components like cables transformers, etc. conducts harmonic studies as per IEEE 519-2014, and finds out the solutions. if it exceeds the limits prescribed in the standard then go for a filter
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