5.8.3 Setting the thresholds for the Operating Time 426
5.8.4 Setting the Thresholds for Excesssive Fault Frequency 426
6 CB State Monitoring 427
6.1 CB State Monitor 428
7 Circuit Breaker Control 429
7.1 CB Control using the IED Menu 429
7.2 CB Control using the Hotkeys 430
7.3 CB Control using the Function Keys 430
7.4 CB Control using the Opto-inputs 431
7.5 Remote CB Control 431
7.6 CB Healthy Check 432
7.7 Synchronisation Check 432
7.8 CB Control AR Implications 432
7.9 CB Control Logic Diagram 433
8 Pole Dead Function 435
8.1 Pole Dead Logic 435
9 System Checks 436
9.1 System Checks Implementation 436
9.1.1 VT Connections 436
9.1.2 Voltage Monitoring 437
9.1.3 Check Synchronisation 437
9.1.4 Check Syncronisation Vector Diagram 437
9.2 Voltage Monitor for CB Closure 439
9.3 Check Synchronisation Monitor for CB Closure 440
9.4 System Check PSL 442
9.5 Application Notes 442
9.5.1 Predictive Closure of Circuit Breakers 442
9.5.2 Voltage and Phase Angle Correction 442
Chapter 17 Supervision 445
1 Chapter Overview 447
2 Voltage Transformer Supervision 448
2.1 Loss of One or Two Phase Voltages 448
2.2 Loss of all Three Phase Voltages 448
2.3 Absence of all Three Phase Voltages on Line Energisation 448
2.4 VTS Implementation 449
2.5 VTS Logic 450
3 Current Transformer Supervision 452
3.1 CTS Implementation 452
3.2 Standard CTS Logic 453
3.3 CTS Blocking 453
3.4 Application Notes 453
3.4.1 Setting Guidelines 453
4 Trip Circuit Supervision 454
4.1 Trip Circuit Supervision Scheme 1 454
4.1.1 Resistor Values 454
4.1.2 PSL for TCS Scheme 1 455
4.2 Trip Circuit Supervision Scheme 2 455
4.2.1 Resistor Values 456
4.2.2 PSL for TCS Scheme 2 456
4.3 Trip Circuit Supervision Scheme 3 456
4.3.1 Resistor Values 457
4.3.2 PSL for TCS Scheme 3 457
Chapter 18 Digital I/O and PSL Configuration 459
P446SV Contents
P446SV-TM-EN-1 xi
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