3.4 Non-Directional Overcurrent Logic 204
3.5 Directional Element 205
3.5.1 Implementing Directionalisation 205
3.5.2 Directional Overcurrent Logic 207
3.6 Application Notes 207
3.6.1 Setting Guidelines 207
3.6.2 Parallel Feeders 209
4 Voltage Dependent Overcurrent Element 210
4.1 Current Setting Threshold Selection 210
4.2 VCO Implementation 210
5 Negative Sequence Overcurrent Protection 212
5.1 NPSOC Protection Implementation 212
5.2 Non-Directional NPSOC Logic 212
5.3 Directional Element 213
5.3.1 Directional NPSOC Logic 213
5.4 Application Notes 214
5.4.1 Setting Guidelines (General) 214
5.4.2 Setting Guidelines (Current Threshold) 214
5.4.3 Setting Guidelines (Time Delay) 214
5.4.4 Setting Guidelines (Directional element) 214
6 Earth Fault Protection 216
6.1 Earth Fault Protection Elements 216
6.2 Non-directional Earth Fault Logic 217
6.3 IDG Curve 217
6.4 Directional Element 218
6.4.1 Residual Voltage Polarisation 218
6.4.2 Negative Sequence Polarisation 219
6.5 Application Notes 220
6.5.1 Setting Guidelines (Non-directional) 220
6.5.2 Setting Guidelines (Directional Element) 221
7 Second Harmonic Blocking 222
7.1 Second Harmonic Blocking Implementation 222
7.2 Second Harmonic Blocking Logic 223
7.3 EF Second Harmonic Blocking Logic 223
7.4 Application Notes 223
7.4.1 Setting Guidelines 223
Chapter 10 CB Fail Protection 225
1 Chapter Overview 227
2 Circuit Breaker Fail Protection 228
3 Circuit Breaker Fail Implementation 229
3.1 Circuit Breaker Fail Timers 229
3.2 Zero Crossing Detection 230
4 Circuit Breaker Fail Logic 231
5 Application Notes 233
5.1 Reset Mechanisms for CB Fail Timers 233
5.2 Setting Guidelines (CB fail Timer) 233
5.3 Setting Guidelines (Undercurrent) 234
Chapter 11 Voltage Protection Functions 235
1 Chapter Overview 237
2 Undervoltage Protection 238
2.1 Undervoltage Protection Implementation 238
2.2 Undervoltage Protection Logic 239
2.3 Application Notes 240
Contents P64x
vi P64x-TM-EN-1.3
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