Virtual Outputs ......................................................................................................................................4 - 106

Analog Outputs .....................................................................................................................................4 - 107

Protection ....................................................................................................................................... 4 - 108

Motor Elements.....................................................................................................................................4 - 110

Percent Differential ............................................................................................................................. 4 - 110

Thermal Model (49).............................................................................................................................. 4 - 117

Current Unbalance (46) ..................................................................................................................... 4 - 138

Mechanical Jam (50LR) ..................................................................................................................... 4 - 143

Undercurrent (37)................................................................................................................................. 4 - 146

Loss of Excitation (40)......................................................................................................................... 4 - 149

Overload Alarm..................................................................................................................................... 4 - 155

Short Circuit ............................................................................................................................................ 4 - 157

Ground Fault (50SG)............................................................................................................................ 4 - 160

Acceleration Time ................................................................................................................................ 4 - 164

Underpower (37P) ................................................................................................................................ 4 - 167

2-Speed Motor.......................................................................................................................................4 - 170

2-Speed Thermal Model.................................................................................................................... 4 - 170

2-Speed Acceleration......................................................................................................................... 4 - 171

2-Speed Undercurrent....................................................................................................................... 4 - 174

Current Elements .................................................................................................................................4 - 176

Inverse Time Overcurrent Curves................................................................................................. 4 - 176

Percent of Load-To-Trip.................................................................................................................... 4 - 183

Phase Time Overcurrent Protection (51P)................................................................................. 4 - 184

Phase Instantaneous Overcurrent Protection (50P) ............................................................ 4 - 187

Phase Directional Overcurrent Protection (67P).................................................................... 4 - 189

Neutral Time Overcurrent Protection (51N) ............................................................................. 4 - 192

Neutral Instantaneous Overcurrent Protection (50N)......................................................... 4 - 195

Neutral Directional Overcurrent Protection (67N) ................................................................ 4 - 198

Ground Time Overcurrent Protection (51G) ............................................................................. 4 - 203

Ground Instantaneous Overcurrent Protection (50G)......................................................... 4 - 205

Negative Sequence Instantaneous Overcurrent Protection (50_2).............................. 4 - 207

Voltage Elements .................................................................................................................................4 - 210

Phase Reversal (47) ............................................................................................................................. 4 - 211

Undervoltage Curves ......................................................................................................................... 4 - 213

Phase Undervoltage Protection (27P)......................................................................................... 4 - 214

Phase Overvoltage Protection (59P)............................................................................................ 4 - 217

Auxiliary Undervoltage (27X) .......................................................................................................... 4 - 220

Auxiliary Overvoltage Protection (59X) ...................................................................................... 4 - 223

Neutral Overvoltage Protection (59N) ........................................................................................ 4 - 226

Negative Sequence Overvoltage Protection (59_2) ............................................................. 4 - 229

Volts per Hertz (24) .............................................................................................................................. 4 - 231

Impedance Elements .........................................................................................................................4 - 236

Out-of-step (78)..................................................................................................................................... 4 - 238

Power Elements ....................................................................................................................................4 - 243

Directional Power (32)........................................................................................................................ 4 - 244

Reactive Power (40Q) ......................................................................................................................... 4 - 249

Frequency Elements...........................................................................................................................4 - 252

Underfrequency (81U) ....................................................................................................................... 4 - 252

Overfrequency (81O) .......................................................................................................................... 4 - 255

Frequency Rate of Change (81R).................................................................................................. 4 - 258

Monitoring...................................................................................................................................... 4 - 262

Breaker......................................................................................................................................................4 - 262

Trip and Close Circuit Monitoring ................................................................................................. 4 - 262

Breaker Arcing Current...................................................................................................................... 4 - 270

Breaker Health ...................................................................................................................................... 4 - 273

869 MOTOR PROTECTION SYSTEM - INSTRUCTION MANUAL

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