GE P24DM - Page 15

3.8 Repair and Modification Procedure 427
Chapter 21 Technical Specifications 429
1 Chapter Overview 431
2 Interfaces 432
2.1 Front USB Port 432
2.2 Rear Serial Port 1 432
2.3 Rear Serial Port 2 432
2.4 IRIG-B Port 432
2.5 Rear Ethernet Port Copper 433
2.6 Rear Ethernet Port - Fibre 433
2.6.1 100 Base FX Receiver Characteristics 433
2.6.2 100 Base FX Transmitter Characteristics 433
3 Performance of Current Protection Functions 434
3.1 Three-phase Overcurrent Protection 434
3.1.1 Three-phase Overcurrent Directional Parameters 434
3.1.2 Thermal Overload Protection 434
3.2 Earth Fault Protection 434
3.2.1 Earth Fault Directional Parameters 435
3.3 Sensitive Earth Fault Protection 435
3.3.1 SEF Directional Parameters 436
3.4 Restricted Earth Fault Protection 436
3.5 Negative Sequence Overcurrent Protection 436
3.5.1 NPSOC Directional Parameters 437
3.6 Stall Protection 437
3.7 Circuit Breaker Fail and Undercurrent Protection 437
3.8 Broken Conductor Protection 437
3.9 Selective Overcurrent Protection 437
3.10 Cold Load Pickup Protection 438
4 Performance of Voltage Protection Functions 439
4.1 Undervoltage Protection 439
4.2 Overvoltage Protection 439
4.3 Residual Overvoltage Protection 439
4.4 Negative Sequence Voltage Protection 439
4.5 Rate of Change of Voltage Protection 440
5 Performance of Frequency Protection Functions 441
5.1 Overfrequency Protection 441
5.2 Underfrequency Protection 441
5.3 Supervised Rate of Change of Frequency Protection 441
5.4 Independent Rate of Change of Frequency Protection 442
5.5 Average Rate of Change of Frequency Protection 442
5.6 Load Restoration 443
5.7 Anti-Backspin 443
6 Power Protection Functions 444
6.1 Reverse Power Protection 444
7 Performance of Monitoring and Control Functions 445
7.1 Voltage Transformer Supervision 445
7.2 Current Transformer Supervision 445
7.3 CB State and Condition Monitoring 445
7.4 PSL Timers 445
7.5 DC Supply Monitor 445
8 Measurements and Recording 447
8.1 General 447
8.2 Measured Operating Data 447
8.3 Disturbance Records 448
8.4 Event, Fault and Maintenance Records 448
P24xM Contents
P24xM-TM-EN-2.1 xiii