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MICOM P123 protection relay has been made to control and protect current and ground faults for overhead and cable lines, and MICOM P441 is one of the distance relays that’s responsible for protection control and monitoring of transmission lines.

Through this course, you can learn how to configure and work with these relays.

  • Online video training
  • Trainer: Dr. Saeed Roostaee (Profile)
  • 4 hrs pre-recorded videos + 4 hrs attached supplementary videos on google drive + data models + PDF files

Part 01: MiCOM relays range, naming, and application

Parts 2-7: exercises with MiCOM P123 and AMT105 setup. Three-phase signals are injected into the relay to test hardware connection and protection functions.

Parts 8-17: exercises with MiCOM P441 and AMT105 (configuration and PSL, event and disturbance recorder, overcurrent protection, voltage protection, negative sequence protection, and distance protection parameters)

Supplementary files attached

  • 01- start working with Easergy Studio in online mode
  • 02- MiCOM Relay Measurements, Event Logs & Disturbance Records
  • 03- Input naming in the Micom relays
  • 04- Communicate with MiCom P139
  • 05- Communicating with MICOM P139 checking the parameters from the front panel
  • 06- Binary input test from MICOM P139 front panel
  • 07- Binary input test from MICOM P139 front Easergy studio
  • 08 Function Parameters in the MICOM P139
  • 09- Overcurrent Function test in the Micom P139
  • 10- Inverse time overcurrent function IDMT test in the MiCOM P139
  • 11- CBF function config and parameters in the Micom P139
  • 12- Autorecoser function config in the MiCOMp139
  • 13- Autorecoser function test in the MiCOMp139
  • 14- Autorecoser function test in the MiCOMp139 By FREJA
  • 15- Under and Over Voltage protection function parameters and testing in the MiCOM P443
  • 16- Overcurrent and Earth Fault protection function parameters and testing in the MiCOM P443
  • 17- DEF protection function parameters and testing in the MiCOM P443
  • 18- Auto recloser function test in the MiCOM P546
  • 19- Trip Scheme in the Micom P546
  • 20- SOTF in the Micom P546
  • 21- MICOM P546 Differential protection test
  • 22- MICOM P546 Syncro Check
MiCOM P123 front panel
Easergy Studio

Certificate of Completion

After activating the MiCOM training pack on your system, we will issue your certificate for the course.

  1. M-1000: Click here to download
  2. M-1001: Click here to download
  3. M-1002: Click here to download
  4. M-1003: Click here to download
  5. M-1004: Click here to download
  6. M-1005: Click here to download
  7. M-1006: Click here to download
  8. M-1007: Click here to download
  9. M-1008: Click here to download
  10. M-1009: Click here to download
  11. M-1010: Click here to download
  12. M-1011: Click here to download
  13. M-1012: Click here to download
  14. M-1013: Click here to download
  15. M-1014: Click here to download
  16. M-1015: Click here to download
  17. M-1016: Click here to download
  18. M-1017: Click here to download
  19. M-1018: Click here to download
  20. M-1019: Click here to download
  21. M-1020: Click here to download
  22. M-1021: Click here to download
  23. M-1022: Click here to download
  24. M-1023: Click here to download
  25. M-1024: Click here to download
  26. M-1025: Click here to download
  27. M-1026: Click here to download
  28. M-1027: Click here to download

Relay protection against the high current was the earliest relay protection mechanism to develop. From this basic method, the graded overcurrent relay protection system, discriminative short circuit protection, has been formulated. This should not be mixed with ‘overload’ relay protection, which typically utilizes relays that function in a time-related to some degree to the thermal capacity of the equipment to be protected. On the contrary, overcurrent relay protection is completely directed to the clearance of short circuits, even though with the settings typically assumed some measure of overload relay protection may be obtained.

Types of Overcurrent Relay

  • Instantaneous Overc1r11e1nt Relay
  • Inverse Time Overcurrent Relay (IDMT Relay)
  • Directional overcurrent relay
  • 1Mixed IDMT and high set instantaneous

Instantaneously overcurrent relay operates when the current exceeds its Pickup value. The operation of this relay is based on the current magnitude and it is without any time delay.


Instantaneous Overcurrent Relay

STANDARD IDMT OVERCURRENT PROTECTION RELAYS

The current/time-tripping characteristics of IDMT protection relays may need to be changed according to the functioning time needed and the characteristics of other relay protection elements used in the electrical network0.10 For these needs, IEC 60255 determined the number of standard characteristics. These are:

  • Standard Inverse characteristic (SI)
  • Very Inverse characteristic (VI)
  • Extremely Inverse characteristic (EI)
  • Definite Time characteristic (DT)
inverse time relay coordination
Time Delay between Relay

MIXED IDMT AND HIGH SET INSTANTANEOUS OVERCURRENT PROTECTION RELAYS

A high-set instantaneous device can be utilized where the source impedance is small in comparison with the protected circuit impedance. This allows a decrease in the operating time at high short circuit levels possible. It also enhances the overall electrical system grading by allowing the ‘discriminating protection curves’ behind the high set instantaneous device to be reduced. One of the benefits of high-set instantaneous devices is to decrease the tripping time of the circuit protection. If the source impedance stays constant, it is then feasible to accomplish high-speed relay protection over a large part of the protected circuit. The quick short circuit clearance time helps to decrease damage at the short circuit location. Grading with the protection relay directly behind the protection relay, which has the instantaneous devices enabled, is accomplished at the current setting of the instantaneous devices and not at the maximum short circuit level.

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DIRECTIONAL OVERCURRENT RELAY

When a short circuit current can go in both directions through the protection relay location, it may be required to make the response of the protection relay directional by the initiation of a directional control device. The device is provided by the use of extra voltage inputs to the protection relay. There are many ways for an appropriate connection of voltage and current signals. The different connections depend on the phase angle, at a unity system power factor, by which the current and voltage used in the protection relay are displaced

directional overcurrent protection basic principal
directional overcurrent protection

ABB Overcurrent Relay
AREVA Overcurrent Relay

Leave a comment on this post, we will send you the “Overcurrent Protection Fundamentals. pdf ” for FREE