GE MiCOM P145 Agile User Manual

Figure 78: Load blinder and angle 152
Figure 79: Load Blinder logic 3phase 153
Figure 80: Load Blinder logic phase A 154
Figure 81: Admittance protection 156
Figure 82: Conductance operation 157
Figure 83: Susceptance operation 157
Figure 84: Simplified busbar representation 159
Figure 85: High Impedance differential protection for busbars 160
Figure 86: REF protection for delta side 164
Figure 87: REF protection for star side 164
Figure 88: REF Protection for resistance-earthed systems 165
Figure 89: REF Protection for solidly earthed system 166
Figure 90: Low Impedance REF Connection 167
Figure 91: Three-slope REF bias characteristic 168
Figure 92: High Impedance REF principle 169
Figure 93: High Impedance REF Connection 170
Figure 94: REF bias characteristic 172
Figure 95: Star winding, resistance earthed 174
Figure 96: Percentage of winding protected 175
Figure 97: Low Impedance REF Scaling Factor 176
Figure 98: Hi-Z REF protection for a grounded star winding 177
Figure 99: Hi-Z REF protection for a delta winding 177
Figure 100: Hi-Z REF Protection for autotransformer configuration 178
Figure 101: High Impedance REF for the LV winding 179
Figure 102: Circuit Breaker Fail logic - three phase start 187
Figure 103: Circuit Breaker Fail logic - single phase start 188
Figure 104: Circuit Breaker Fail Trip and Alarm 189
Figure 105: Undercurrent and Zero Crossing Detection Logic for CB Fail 190
Figure 106: CB Fail SEF Protection Logic 191
Figure 107: CB Fail Non Current Protection Logic 192
Figure 108: Circuit Breaker mapping 193
Figure 109: CB Fail timing 195
Figure 110: Undervoltage - single and three phase tripping mode (single stage) 211
Figure 111: Overvoltage - single and three phase tripping mode (single stage) 214
Figure 112: Rate of Change of Voltage protection logic 216
Figure 113: Residual Overvoltage logic 219
Figure 114: Residual voltage for a solidly earthed system 220
Figure 115: Residual voltage for an impedance earthed system 221
Figure 116: Star connected condenser bushings 222
Figure 117: Theoretical earth fault in condenser bushing system 222
P14x Table of Figures
P14xEd1-TM-EN-1 xxi

GE MiCOM P145 Agile Specifications

General

Brand	GE
Model	MiCOM P145 Agile
Category	Control Unit
Language	English