
vi D60 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
TABLE OF CONTENTS
5.5.6 FlexCurves.......................................................................................................................... 5-158
5.5.7 Phasor Measurement Unit.......................................................................................... 5-165
5.6 FlexLogic.............................................................................................................. 5-185
5.6.1 FlexLogic operands........................................................................................................ 5-185
5.6.2 FlexLogic rules.................................................................................................................. 5-202
5.6.3 FlexLogic evaluation...................................................................................................... 5-202
5.6.4 FlexLogic example..........................................................................................................5-202
5.6.5 FlexLogic equation editor............................................................................................ 5-207
5.6.6 FlexLogic timers............................................................................................................... 5-207
5.6.7 FlexElements ..................................................................................................................... 5-207
5.6.8 Non-volatile latches.......................................................................................................5-212
5.7 Grouped elements............................................................................................. 5-213
5.7.1 Overview ............................................................................................................................. 5-213
5.7.2 Setting group 1................................................................................................................. 5-214
5.7.3 Line pickup ......................................................................................................................... 5-214
5.7.4 Distance............................................................................................................................... 5-217
5.7.5 Power swing detect (ANSI 68).................................................................................... 5-238
5.7.6 Load encroachment ...................................................................................................... 5-247
5.7.7 Phase current ................................................................................................................... 5-248
5.7.8 Neutral current................................................................................................................. 5-260
5.7.9 Wattmetric ground fault.............................................................................................. 5-268
5.7.10 Ground current ................................................................................................................ 5-272
5.7.11 Negative sequence current........................................................................................ 5-275
5.7.12 Breaker failure (ANSI 50BF)......................................................................................... 5-281
5.7.13 Voltage elements ............................................................................................................ 5-291
5.7.14 Sensitive directional power........................................................................................ 5-300
5.8 Control elements ............................................................................................... 5-303
5.8.1 Overview ............................................................................................................................. 5-303
5.8.2 Trip bus ................................................................................................................................ 5-303
5.8.3 Setting groups .................................................................................................................. 5-305
5.8.4 Selector switch................................................................................................................. 5-307
5.8.5 Trip output.......................................................................................................................... 5-313
5.8.6 Underfrequency (ANSI 81U)........................................................................................ 5-319
5.8.7 Overfrequency (ANSI 81O) .......................................................................................... 5-320
5.8.8 Frequency rate of change (ANSI 81R).................................................................... 5-321
5.8.9 Synchrocheck (ANSI 25) ............................................................................................... 5-322
5.8.10 Autoreclose (ANSI 79).................................................................................................... 5-328
5.8.11 Digital elements............................................................................................................... 5-341
5.8.12 Digital counters................................................................................................................ 5-344
5.8.13 Monitoring elements ..................................................................................................... 5-346
5.8.14 Pilot schemes.................................................................................................................... 5-371
5.9 Inputs/outputs ................................................................................................... 5-394
5.9.1 Contact inputs.................................................................................................................. 5-394
5.9.2 Virtual inputs..................................................................................................................... 5-396
5.9.3 Contact outputs............................................................................................................... 5-397
5.9.4 Virtual outputs.................................................................................................................. 5-400
5.9.5 Resetting ............................................................................................................................. 5-400
5.9.6 Direct inputs and outputs ........................................................................................... 5-401
5.9.7 Teleprotection inputs and outputs ......................................................................... 5-405
5.10 Transducer inputs/outputs.............................................................................. 5-407
5.10.1 DCmA inputs...................................................................................................................... 5-407
5.10.2 RTD inputs .......................................................................................................................... 5-408
5.10.3 DCmA outputs .................................................................................................................. 5-409
5.11 Testing................................................................................................................. 5-413
5.11.1 Test mode function ........................................................................................................5-413
5.11.2 Test mode forcing........................................................................................................... 5-413