GE MiCOM P40 Agile User Manual

Figure 78: Biased Neutral Current Detector Characteristic 171
Figure 79: Load Blinder Characteristics 174
Figure 80: Sequence networks connection for an internal A-N fault 177
Figure 81: - DV Forward and Reverse tripping regions 178
Figure 82: Current level (amps) at which transient faults are self-extinguishing 179
Figure 83: Earth fault in Petersen Coil earthed system 180
Figure 84: Distribution of currents during a Phase C fault 180
Figure 85: Phasors for a phase C earth fault in a Petersen Coil earthed system 181
Figure 86: Zero sequence network showing residual currents 181
Figure 87: Phase C earth fault in Petersen Coil earthed system: practical case with resistance
present
182
Figure 88: Voltage distribution in an isolated system for a Phase-A-to-Earth fault 185
Figure 89: Biased Neutral Current Detector 185
Figure 90: First earth fault detection 186
Figure 91: Second earth fault detection logic 187
Figure 92: Priority setting enable logic 189
Figure 93: Zone starting logic 190
Figure 94: Zone timer logic 191
Figure 95: Zone trip logic 192
Figure 96: Settings required to apply a quadrilateral zone 193
Figure 97: Settings required to apply a mho zone 194
Figure 98: Over-tilting effect 196
Figure 99: Example power system 201
Figure 100: Apparent Impedances seen by Distance Protection on a Teed Feeder 206
Figure 101: Scheme Assignment 211
Figure 102: Aided Distance PUR scheme 214
Figure 103: Aided Distance POR scheme 216
Figure 104: Example of fault current reversal of direction 218
Figure 105: Aided Distance Blocking scheme (BOP) 220
Figure 106: Aided Distance Send logic 222
Figure 107: Carrier Aided Schemes Receive logic 223
Figure 108: Aided Distance Tripping logic 223
Figure 109: PUR Aided Tripping logic 224
Figure 110: POR Aided Tripping logic 225
Figure 111: Aided Scheme Blocking 1 Tripping logic 226
Figure 112: Aided Scheme Blocking 2 Tripping logic 226
Figure 113: Virtual Current Polarization 229
Figure 114: Directional criteria for residual voltage polarization 230
Figure 115: Aided DEF POR scheme 232
Figure 116: Aided DEF Blocking scheme 233
P543i/P545i Table of Figures
P54x1i-TM-EN-1 xxvii

GE MiCOM P40 Agile Specifications

General

Brand	GE
Model	MiCOM P40 Agile
Category	Control Unit
Language	English