GE L90 Instruction Manual page 6
Line current differential system
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- Instruction manual (832 pages) ,
- Communications manual (532 pages) ,
- Instruction manual (700 pages)
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5.5.3
Signal sources .................................................................................................................. 5-139
5.5.4
87L power system .......................................................................................................... 5-142
5.5.5
Breakers .............................................................................................................................. 5-150
5.5.6
Disconnect switch control .......................................................................................... 5-155
5.5.7
FlexCurves .......................................................................................................................... 5-160
5.5.8
Phasor Measurement Unit.......................................................................................... 5-167
5.6
FlexLogic.............................................................................................................. 5-187
5.6.1
FlexLogic operands........................................................................................................ 5-187
5.6.2
FlexLogic rules.................................................................................................................. 5-203
5.6.3
FlexLogic evaluation...................................................................................................... 5-204
5.6.4
FlexLogic example.......................................................................................................... 5-204
5.6.5
FlexLogic equation editor............................................................................................ 5-209
5.6.6
FlexLogic timers............................................................................................................... 5-209
5.6.7
FlexElements ..................................................................................................................... 5-209
5.6.8
Non-volatile latches....................................................................................................... 5-214
5.7
Grouped elements ............................................................................................. 5-216
5.7.1
Overview ............................................................................................................................. 5-216
5.7.2
Setting group 1................................................................................................................. 5-216
5.7.3
Line differential elements............................................................................................ 5-217
5.7.4
Line pickup ......................................................................................................................... 5-222
5.7.5
Distance............................................................................................................................... 5-224
5.7.6
Power swing detect (ANSI 68).................................................................................... 5-245
5.7.7
Load encroachment ...................................................................................................... 5-254
5.7.8
Phase current ................................................................................................................... 5-255
5.7.9
Neutral current................................................................................................................. 5-267
5.7.10
Wattmetric ground fault.............................................................................................. 5-275
5.7.11
Ground current ................................................................................................................ 5-279
5.7.12
Negative sequence current........................................................................................ 5-286
5.7.13
Breaker failure (ANSI 50BF)......................................................................................... 5-292
5.7.14
Voltage elements ............................................................................................................ 5-302
5.7.15
Supervising elements.................................................................................................... 5-314
5.7.16
Sensitive directional power ........................................................................................ 5-321
5.8
Control elements ............................................................................................... 5-324
5.8.1
Overview ............................................................................................................................. 5-324
5.8.2
Trip bus ................................................................................................................................ 5-324
5.8.3
Setting groups .................................................................................................................. 5-326
5.8.4
Selector switch................................................................................................................. 5-328
5.8.5
Trip output.......................................................................................................................... 5-334
5.8.6
Underfrequency (ANSI 81U)........................................................................................ 5-340
5.8.7
Overfrequency (ANSI 81O) .......................................................................................... 5-341
5.8.8
Synchrocheck (ANSI 25) ............................................................................................... 5-342
5.8.9
Digital elements............................................................................................................... 5-347
5.8.10
Digital counters................................................................................................................ 5-350
5.8.11
Monitoring elements ..................................................................................................... 5-352
5.8.12
Pilot schemes.................................................................................................................... 5-376
5.8.13
Autoreclose (ANSI 79) .................................................................................................... 5-399
5.8.14
Frequency rate of change (ANSI 81R).................................................................... 5-412
5.9
Inputs/outputs ................................................................................................... 5-413
5.9.1
Contact inputs .................................................................................................................. 5-413
5.9.2
Virtual inputs ..................................................................................................................... 5-415
5.9.3
Contact outputs............................................................................................................... 5-416
5.9.4
Virtual outputs.................................................................................................................. 5-420
5.9.5
Direct inputs and outputs ........................................................................................... 5-420
5.9.6
Resetting ............................................................................................................................. 5-421
5.10 Transducer inputs/outputs.............................................................................. 5-422
5.10.1
DCmA inputs...................................................................................................................... 5-422
L90 LINE CURRENT DIFFERENTIAL SYSTEM - INSTRUCTION MANUAL
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