IV 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
Analog Outputs.....................................................................................................................................4 - 106
Protection....................................................................................................................................... 4 - 108
Feeder Elements...................................................................................................................................4 - 110
Undercurrent (37).................................................................................................................................4 - 110
Current Elements .................................................................................................................................4 - 113
Inverse Time Overcurrent Curves.................................................................................................4 - 114
Percent of Load-To-Trip....................................................................................................................4 - 121
Phase Time Overcurrent Protection (51P).................................................................................4 - 121
Phase Instantaneous Overcurrent Protection (50P) ............................................................4 - 124
Phase Directional Overcurrent Protection (67P)....................................................................4 - 126
Neutral Time Overcurrent Protection (51N).............................................................................4 - 129
Neutral Instantaneous Overcurrent Protection (50N).........................................................4 - 132
Neutral Directional Overcurrent Protection (67N) ................................................................4 - 135
Ground Time Overcurrent Protection (51G).............................................................................4 - 140
Ground Instantaneous Overcurrent Protection (50G).........................................................4 - 142
Ground Directional Overcurrent Protection (67G) ................................................................4 - 144
Sensitive Ground Time Overcurrent Protection (51SG).......................................................4 - 149
Sensitive Ground Instantaneous Overcurrent Protection (50SG)..................................4 - 152
Sensitive Ground Directional Overcurrent Protection (67SG)..........................................4 - 154
Restricted Ground (Earth) Fault (87G) .........................................................................................4 - 159
Switch on to Fault (SOTF)..................................................................................................................4 - 164
Negative Sequence Time Overcurrent Protection (51_2)..................................................4 - 167
Negative Sequence Instantaneous Overcurrent Protection (50_2)..............................4 - 169
Negative Sequence Directional Overcurrent Protection (67_2).....................................4 - 172
Broken Conductor................................................................................................................................4 - 176
Load Encroachment ...........................................................................................................................4 - 178
Thermal Overload (49) .......................................................................................................................4 - 182
Voltage Elements .................................................................................................................................4 - 185
Undervoltage Curves .........................................................................................................................4 - 185
Phase Undervoltage Protection (27P).........................................................................................4 - 187
Timed Undervoltage Protection (27T).........................................................................................4 - 190
UV Reactive Power (27Q)..................................................................................................................4 - 200
Auxiliary Undervoltage (27X) ..........................................................................................................4 - 207
Phase Overvoltage Protection (59P)............................................................................................4 - 210
Auxiliary Overvoltage Protection (59X) ......................................................................................4 - 213
Neutral Overvoltage Protection (59N) ........................................................................................4 - 216
Negative Sequence Overvoltage Protection (59_2).............................................................4 - 219
Admittance..............................................................................................................................................4 - 221
Neutral Admittance (21YN)..............................................................................................................4 - 221
Power Elements....................................................................................................................................4 - 228
Directional Power (32)........................................................................................................................4 - 228
Wattmetric Ground Fault (32N).....................................................................................................4 - 234
Frequency Elements...........................................................................................................................4 - 239
Underfrequency (81U) .......................................................................................................................4 - 239
Overfrequency (81O) ..........................................................................................................................4 - 242
Frequency Rate of Change (81R)..................................................................................................4 - 245
Fast Underfrequency.........................................................................................................................4 - 249
Monitoring...................................................................................................................................... 4 - 253
Trip and Close Circuit Monitoring .................................................................................................4 - 253
Breaker Arcing Current......................................................................................................................4 - 261
Breaker Health ......................................................................................................................................4 - 264
Functions .................................................................................................................................................4 - 268
Power Factor (55).................................................................................................................................4 - 268
Demand....................................................................................................................................................4 - 274
Pulsed Outputs......................................................................................................................................4 - 283
Digital Counters....................................................................................................................................4 - 286
Harmonic Detection ...........................................................................................................................4 - 289
RTD Temperature.................................................................................................................................4 - 292
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