2.3 Rear Serial Port 1 508
2.4 Fibre Rear Serial Port 1 508
2.5 Rear Serial Port 2 509
2.6 Optional Rear Serial Port (SK5) 509
2.7 IRIG-B (Demodulated) 509
2.8 IRIG-B (Modulated) 509
2.9 Rear Ethernet Port Copper 510
2.10 Rear Ethernet Port Fibre 510
2.10.1 100 Base FX Receiver Characteristics 510
2.10.2 100 Base FX Transmitter Characteristics 511
2.11 1 PPS Port 511
2.12 Fibre Teleprotection Interface 511
3 Protection Functions 512
3.1 Phase Current Differential Protection 512
3.2 Fibre Teleprotection Transfer Times 512
3.3 Autoreclose and Check Synychronism 512
3.4 Phase Overcurrent Protection 512
3.4.1 Phase Overcurrent Directional Parameters 513
3.5 Earth Fault Protection 513
3.5.1 Earth Fault Directional Parameters 513
3.6 Sensitive Earth Fault Protection 514
3.6.1 Sensitive Earth Fault Protection Directional Element 514
3.7 High Impedance Restricted Earth Fault Protection 514
3.8 Negative Sequence Overcurrent Protection 515
3.8.1 NPSOC Directional Parameters 515
3.9 Circuit Breaker Fail and Undercurrent Protection 515
3.10 Broken Conductor Protection 515
3.11 Thermal Overload Protection 515
4 Monitoring, Control and Supervision 516
4.1 Voltage Transformer Supervision 516
4.2 Standard Current Transformer Supervision 516
4.3 Differential Current Transformer Supervision 516
4.4 CB State and Condition Monitoring 516
4.5 PSL Timers 517
5 Measurements and Recording 518
5.1 General 518
5.2 Disturbance Records 518
5.3 Event, Fault and Maintenance Records 518
5.4 Fault Locator 518
6 Ratings 519
6.1 AC Measuring Inputs 519
6.2 Current Transformer Inputs 519
6.3 Voltage Transformer Inputs 519
6.4 Auxiliary Supply Voltage 519
6.5 Nominal Burden 520
6.6 Power Supply Interruption 520
6.7 Battery Backup 521
7 Input / Output Connections 522
7.1 Isolated Digital Inputs 522
7.1.1 Nominal Pickup and Reset Thresholds 522
7.2 Standard Output Contacts 522
7.3 High Break Output Contacts 523
7.4 Watchdog Contacts 523
8 Mechanical Specifications 524
8.1 Physical Parameters 524
8.2 Enclosure Protection 524
8.3 Mechanical Robustness 524
Contents P54A/B/C/E
xvi P54xMED-TM-EN-1