OVERCURRENT PROTECTION RELAY (3-phase) BLOCK MICOM P123

Application:-
1. Phase and earth fault over current protections applicable in HV and MV substations and to protect MV and LV transformers

Protections:-
1. 3-phase over current, phase-to-phase, 3-stage, DT or IDMT
2. Earth fault, 3-stage, DT or IDMT
3. Thermal overload with 1 thermal time constant
4. Undercurrent, single stage
5. Negative phase sequence over current, IDMT and DT

Measurements:-
1. Phase currents
2. Earth current
3. Thermal state

Functions:-
1. 2 setting group
2. Circuit breaker control
3. CB status monitoring
4. Protection blocking logic
5. Output contact latching
6. Programmable binary inputs, outputs relays and LEDs:
7. P122 3 inputs / 6 outputs
8. P123 5 inputs / 8 outputs
9. Communication in RS485/RS232 standard
10. Transmission protocols: Courier, Modbus, IEC60870-5-103 and DNP 3.0
11. Recording of:
• Events – 250
• Faults – 25 (1600 Hz, 3s window)
• Triggers – 25
• Trips – 5 (display)