GE MiCOM P40 Agile User Manual

Figure 39: CT Compensation 113
Figure 40: The need for zero-sequence current filtering 116
Figure 41: Magnetising inrush phenomenon 117
Figure 42: Typical overflux current waveform 119
Figure 43: Phase Current Differential Protection logic for feeders with in-zone transformers 120
Figure 44: Second Harmonic Blocking logic 121
Figure 45: Fifth Harmonic Blocking logic 122
Figure 46: Permissive Intertripping example 123
Figure 47: Stub Bus protection 124
Figure 48: Typical two-terminal plain feeder circuit 129
Figure 49: Typical three-terminal plain feeder circuit 130
Figure 50: System Impedance Ratio 136
Figure 51: Directional mho element construction 139
Figure 52: Offset Mho characteristic 140
Figure 53: Directional Mho element construction – impedance domain 141
Figure 54: Offset Mho characteristics – impedance domain 142
Figure 55: Offset mho characteristics – voltage domain 143
Figure 56: Simplified forward fault 144
Figure 57: Mho expansion – forward fault 145
Figure 58: Simplified Reverse Fault 146
Figure 59: Mho contraction – reverse fault 147
Figure 60: Simplified quadrilateral characteristics 149
Figure 61: General Quadrilateral Characteristic Limits 150
Figure 62: Directional Quadrilateral Characteristic 151
Figure 63: Quadrilateral Characteristic featuring 2 directional forward zones and 1 offset zone 152
Figure 64: Five-sided polygon formed by Quadrilateral characteristic with Directional-Line
intersection of Reverse Impedance Reach Line
153
Figure 65: Impedance Reach line in Z1 plane 156
Figure 66: Impedance Reach line in ZLP plane 157
Figure 67: General characteristic in ZLP plane 158
Figure 68: Phase relations between I2 and Iph for leading and lagging polarizing currents 159
Figure 69: General characteristic in Z1 plane 160
Figure 70: Simplified characteristic in Z1 plane 161
Figure 71: Impedance Reach line construction 163
Figure 72: Reverse impedance reach line construction 164
Figure 73: Resistive reach of phase elements 164
Figure 74: Resistive Reach line construction 165
Figure 75: Reverse resistive reach line construction 166
Figure 76: Phase Fault Quadrilateral characteristic summary 166
Figure 77: Phase to phase current changes for C phase-to-ground (CN) fault 170
Table of Figures P543i/P545i
xxvi P54x1i-TM-EN-1

GE MiCOM P40 Agile Specifications

General

Brand	GE
Model	MiCOM P40 Agile
Category	Control Unit
Language	English