5.22 Monitor Checks for CB Closure 343
5.22.1 Check Synchronisation Monitor for CB Closure 344
5.22.2 Voltage Monitor for CB Closure 345
5.23 Synchronisation Checks for CB Closure 345
5.23.1 Three-phase Autoreclose System Check Logic Diagram 347
5.23.2 CB Manual Close System Check Logic Diagram 348
6 Setting Guidelines 349
6.1 De-ionising Time Guidance 349
6.2 Dead Timer Setting Guidelines 349
6.2.1 Example Dead Time Calculation 349
6.3 Reclaim Time Setting Guidelines 350
Chapter 12 CB Fail Protection 351
1 Chapter Overview 353
2 Circuit Breaker Fail Protection 354
3 Circuit Breaker Fail Implementation 355
3.1 Circuit Breaker Fail Timers 355
3.2 Zero Crossing Detection 355
4 Circuit Breaker Fail Logic 357
4.1 Circuit Breaker Fail Logic - Part 1 357
4.2 Circuit Breaker Fail Logic - Part 2 358
4.3 Circuit Breaker Fail Logic - Part 3 359
4.4 Circuit Breaker Fail Logic - Part 4 360
5 Application Notes 361
5.1 Reset Mechanisms for CB Fail Timers 361
5.2 Setting Guidelines (CB fail Timer) 361
5.3 Setting Guidelines (Undercurrent) 362
Chapter 13 Current Protection Functions 363
1 Chapter Overview 365
2 Phase Fault Overcurrent Protection 366
2.1 POC Implementation 366
2.2 Directional Element 366
2.3 POC Logic 368
3 Negative Sequence Overcurrent Protection 369
3.1 Negative Sequence Overcurrent Protection Implementation 369
3.2 Directional Element 369
3.3 NPSOC Logic 370
3.4 Application Notes 370
3.4.1 Setting Guidelines (Current Threshold) 370
3.4.2 Setting Guidelines (Time Delay) 370
3.4.3 Setting Guidelines (Directional element) 371
4 Earth Fault Protection 372
4.1 Earth Fault Protection Implementation 372
4.2 IDG Curve 372
4.3 Directional Element 373
4.3.1 Residual Voltage Polarisation 373
4.3.2 Negative Sequence Polarisation 374
4.4 Earth Fault Protection Logic 375
4.5 Application Notes 375
4.5.1 Residual Voltage Polarisation Setting Guidelines 375
4.5.2 Setting Guidelines (Directional Element) 375
5 Sensitive Earth Fault Protection 377
5.1 SEF Protection Implementation 377
5.2 EPATR B Curve 377
P543i/P545i Contents
P54x1i-TM-EN-1 ix
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