GE P54C User Manual

Chapter 9 Current Protection Functions 193
1 Chapter Overview 195
2 Phase Fault Overcurrent Protection 196
2.1 POC Implementation 196
2.2 Directional Element 196
2.3 POC Logic 198
3 Negative Sequence Overcurrent Protection 199
3.1 Negative Sequence Overcurrent Protection Implementation 199
3.2 Directional Element 199
3.3 NPSOC Logic 200
3.4 Application Notes 200
3.4.1 Setting Guidelines (Current Threshold) 200
3.4.2 Setting Guidelines (Time Delay) 200
3.4.3 Setting Guidelines (Directional element) 201
4 Earth Fault Protection 202
4.1 Earth Fault Protection Implementation 202
4.2 IDG Curve 202
4.3 Directional Element 203
4.3.1 Residual Voltage Polarisation 203
4.3.2 Negative Sequence Polarisation 204
4.4 Earth Fault Protection Logic 205
4.5 Application Notes 205
4.5.1 Residual Voltage Polarisation Setting Guidelines 205
4.5.2 Setting Guidelines (Directional Element) 205
5 Sensitive Earth Fault Protection 207
5.1 SEF Protection Implementation 207
5.2 EPATR B Curve 207
5.3 Sensitive Earth Fault Protection Logic 208
5.4 Application Notes 209
5.4.1 Insulated Systems 209
5.4.2 Setting Guidelines (Insulated Systems) 210
6 High Impedance REF 212
6.1 High Impedance REF Principle 212
7 Thermal Overload Protection 214
7.1 Single Time Constant Characteristic 214
7.2 Dual Time Constant Characteristic 214
7.3 Thermal Overload Protection Implementation 215
7.4 Thermal Overload Protection Logic 215
7.5 Application Notes 215
7.5.1 Setting Guidelines for Dual Time Constant Characteristic 215
7.5.2 Setting Guidelines for Single Time Constant Characteristic 217
8 Broken Conductor Protection 219
8.1 Broken Conductor Protection Implementation 219
8.2 Broken Conductor Protection Logic 219
8.3 Application Notes 219
8.3.1 Setting Guidelines 219
Chapter 10 Voltage Protection Functions 221
1 Chapter Overview 223
2 Undervoltage Protection 224
2.1 Undervoltage Protection Implementation 224
2.2 Undervoltage Protection Logic 225
2.3 Application Notes 226
2.3.1 Undervoltage Setting Guidelines 226
3 Overvoltage Protection 227
Contents P54A/B/C/E
vi P54xMED-TM-EN-1

GE P54C Specifications

General

Brand	GE
Model	P54C
Category	Relays
Language	English