MULTIFUNCTION DIRECTIONAL LINE PROTECTION RELAY BLOCK MICOM P127

Application
1. Universal 3-phase directional overcurrent protection, applicable in MV substations for both incoming and outgoing feeders, as well as auxiliary protection for HV

Protections:-
1. Overcurrent, against phase-to-phase faults, 3-stage, DT or IDMT (P127 – directional)
2. Earth fault, directional, 5-stage, DT or IDMT ( 3 measured and 2 derived )
3. Wattmetric earth fault, 2-stage (for Petersen coil earthed system)
4. Undercurrent – single stage
5. Residual overvoltage (P127)
6. Negative phase sequence overcurrent, IDMT and DT
7. Thermal overload with 1 thermal time constant
8. Undervoltage, 2 thresholds (P127)
9. Overvoltage, 2 thresholds (P127)
10. Under- and overfrequency (P127)
11. Power directional (P127)
12. Frequency rate of chance (P127)

Measurements
1. Currents and voltages
2. Current and voltage sequences
3. Peak, average and rolling demand
4. Thermal state in %
5. THD i TDD for measure CTs

This MULTIFUNCTION DIRECTIONAL LINE PROTECTION RELAY BLOCK is easily insert in your schematic diagram and connect as you like way.

Functions:-
1. Four-shot autoreclose
2. 8 setting groups
3. Switchgear monitoring
4. Remote and local CB control
5. CB state monitoring
6. CB failure protection
7. Broken conductor detection
8. Cold load pick-up logic
9. Second harmonic blocking
10. Protection blocking logic
11. Selective logic
12. Output relay testing
13. Output contacts latching
14. Programmable binary inputs and outputs:
15. 7 x I / 8 x O
16. extra 5 opto-insulated inputs – option
17. Extensive logic equations: 8 equations with 16 operators each, of AND, OR, AN NOT, OR NOT types
18. Measuring transformers, 0.5 class – option
19. Another RS485 port with Modbus protocol – option
20. Time synchronisation via IRIG-B – option
21. Communication standards RS232 (local) and RS485 (system)
22. Transmission protocols: Modbus, IEC60870-5-103 and DNP3.0
23. Recording of:
24. Events – 250
25. Faults – 25 (1600 Hz, window 3 s)
26. Triggers – 25