2 Undervoltage Protection 204
2.1 Undervoltage Protection Implementation 204
2.2 Undervoltage Protection Logic 205
2.3 Application Notes 206
2.3.1 Undervoltage Protection 206
3 Overvoltage Protection 207
3.1 Overvoltage Protection Implementation 207
3.2 Overvoltage Protection Logic 208
3.3 Application Notes 209
3.3.1 Overvoltage Setting Guidelines 209
4 Residual Overvoltage Protection 210
4.1 Residual Overvoltage Protection Implementation 210
4.2 Residual Overvoltage Logic 211
4.3 Application Notes 211
4.3.1 Calculation for Solidly Earthed Systems 211
4.3.2 Calculation for Impedance Earthed Systems 212
4.3.3 Setting Guidelines 213
5 Negative Sequence Overvoltage Protection 214
5.1 Negative Sequence Overvoltage Implementation 214
5.2 Negative Sequence Overvoltage Logic 214
5.3 Application Notes 214
5.3.1 Setting Guidelines 214
6 Positive Sequence Undervoltage Protection 216
6.1 Positive Sequence Undervoltage Implementation 216
6.2 Positive Sequence Undervoltage Logic 216
7 Positive Sequence Overvoltage Protection 217
7.1 Positive Sequence Overvoltage Implementation 217
7.2 Positive Sequence Overvoltage Logic 217
8 Moving Average Voltage Functions 218
8.1 Moving Average Undervoltage Logic 218
8.2 Moving Average Overvoltage Logic 219
8.3 Moving Average Zero Sequence Voltage Logic 219
8.4 Moving Average Positive Sequence Voltage Logic 220
8.5 Moving Average Negative Sequence Voltage Logic 220
8.6 Moving Average Undervoltage Blocking PSL 220
Chapter 11 Frequency Protection Functions 221
1 Chapter Overview 223
2 Frequency Protection Overview 224
2.1 Frequency Protection Implementation 224
3 Underfrequency Protection 225
3.1 Underfrequency Protection Implementation 225
3.2 Underfrequency Protection Logic 225
3.3 Application Notes 225
3.3.1 Setting Guidelines 225
4 Overfrequency Protection 227
4.1 Overfrequency Protection Implementation 227
4.2 Overfrequency Protection Logic 227
4.3 Application Notes 227
4.3.1 Setting Guidelines 227
5 Independent R.O.C.O.F Protection 229
5.1 Indepenent R.O.C.O.F Protection Implementation 229
5.2 Independent R.O.C.O.F Protection Logic 229
5.3 Application Notes 230
5.3.1 Setting Guidelines 230
6 Frequency-supervised R.O.C.O.F Protection 231
Contents P24xM
vi P24xM-TM-EN-2.1
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