IV 869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Thermal Model.......................................................................................................................................4 - 112
Current Unbalance..............................................................................................................................4 - 134
Mechanical Jam ...................................................................................................................................4 - 139
Undercurrent..........................................................................................................................................4 - 142
Loss of Excitation.................................................................................................................................4 - 145
Overload Alarm.....................................................................................................................................4 - 151
Short Circuit............................................................................................................................................4 - 153
Ground Fault ..........................................................................................................................................4 - 156
Acceleration Time................................................................................................................................4 - 160
Underpower............................................................................................................................................4 - 163
2-Speed Motor.......................................................................................................................................4 - 166
Speed2 Thermal Model .....................................................................................................................4 - 166
Speed2 Acceleration ..........................................................................................................................4 - 168
Speed2 Undecurrent ..........................................................................................................................4 - 170
Current Elements .................................................................................................................................4 - 172
Inverse Time Overcurrent Curves.................................................................................................4 - 172
Percent of Load-To-Trip....................................................................................................................4 - 180
Phase Time Overcurrent Protection............................................................................................4 - 180
Phase Instantaneous Overcurrent Protection........................................................................4 - 184
Phase Directional Overcurrent Protection ...............................................................................4 - 186
Neutral Time Overcurrent Protection.........................................................................................4 - 189
Neutral Instantaneous Overcurrent Protection.....................................................................4 - 192
Neutral Directional Overcurrent Protection ............................................................................4 - 195
Ground Time Overcurrent Protection.........................................................................................4 - 200
Ground Instantaneous Overcurrent Protection.....................................................................4 - 202
Negative Sequence Instantaneous Overcurrent Protection ...........................................4 - 204
Voltage Elements .................................................................................................................................4 - 207
Phase Reversal......................................................................................................................................4 - 207
Undervoltage Curves .........................................................................................................................4 - 210
Phase Undervoltage Protection....................................................................................................4 - 211
Phase Overvoltage Protection.......................................................................................................4 - 214
Auxiliary Undervoltage......................................................................................................................4 - 217
Auxiliary Overvoltage Protection.................................................................................................. 4 - 220
Neutral Overvoltage Protection ....................................................................................................4 - 223
Negative Sequence Overvoltage Protection...........................................................................4 - 226
Volts per Hertz.......................................................................................................................................4 - 228
Impedance Elements .........................................................................................................................4 - 234
Out-of-step .............................................................................................................................................4 - 234
Power Elements....................................................................................................................................4 - 240
Directional Power.................................................................................................................................4 - 240
Reactive Power .....................................................................................................................................4 - 246
Frequency Elements...........................................................................................................................4 - 249
Underfrequency....................................................................................................................................4 - 249
Overfrequency.......................................................................................................................................4 - 252
Frequency Rate of Change..............................................................................................................4 - 255
Monitoring...................................................................................................................................... 4 - 259
Breaker......................................................................................................................................................4 - 259
Trip and Close Circuit Monitoring .................................................................................................4 - 259
Breaker Arcing Current......................................................................................................................4 - 267
Breaker Health ......................................................................................................................................4 - 270
Broken Rotor Bar..................................................................................................................................4 - 274
Stator Inter-Turn Fault.......................................................................................................................4 - 279
Functions .................................................................................................................................................4 - 284
Power Factor..........................................................................................................................................4 - 284
Demand....................................................................................................................................................4 - 289
Pulsed Outputs......................................................................................................................................4 - 297
Digital Counters ....................................................................................................................................4 - 300
Harmonic Detection ...........................................................................................................................4 - 304
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