
vi F60 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
TABLE OF CONTENTS
5.5.6 FlexCurves.......................................................................................................................... 5-160
5.5.7 Phasor Measurement Unit.......................................................................................... 5-167
5.6 FlexLogic.............................................................................................................. 5-187
5.6.1 FlexLogic operands........................................................................................................ 5-187
5.6.2 FlexLogic rules.................................................................................................................. 5-201
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................................................................................................................. 5-213
5.7.3 Load encroachment...................................................................................................... 5-214
5.7.4 Phase current ................................................................................................................... 5-216
5.7.5 Neutral current................................................................................................................. 5-228
5.7.6 Wattmetric ground fault.............................................................................................. 5-236
5.7.7 Ground current ................................................................................................................ 5-240
5.7.8 Negative sequence current........................................................................................ 5-247
5.7.9 Breaker failure (ANSI 50BF)......................................................................................... 5-253
5.7.10 Voltage elements ............................................................................................................ 5-263
5.7.11 Sensitive directional power (ANSI 32) .................................................................... 5-270
5.8 Control elements ............................................................................................... 5-273
5.8.1 Overview ............................................................................................................................. 5-273
5.8.2 Trip bus ................................................................................................................................ 5-273
5.8.3 Setting groups .................................................................................................................. 5-275
5.8.4 Selector switch................................................................................................................. 5-277
5.8.5 Underfrequency (ANSI 81U)........................................................................................ 5-283
5.8.6 Overfrequency (ANSI 81O) .......................................................................................... 5-284
5.8.7 Frequency rate of change (ANSI 81R).................................................................... 5-285
5.8.8 Synchrocheck (ANSI 25) ............................................................................................... 5-287
5.8.9 Autoreclose (ANSI 79).................................................................................................... 5-292
5.8.10 Digital elements............................................................................................................... 5-298
5.8.11 Digital counters................................................................................................................ 5-301
5.9 Monitoring elements......................................................................................... 5-303
5.9.1 Cold load pickup.............................................................................................................. 5-332
5.9.2 Pilot schemes.................................................................................................................... 5-333
5.10 Inputs/outputs ................................................................................................... 5-338
5.10.1 Contact inputs.................................................................................................................. 5-338
5.10.2 Virtual inputs..................................................................................................................... 5-340
5.10.3 Contact outputs............................................................................................................... 5-341
5.10.4 Virtual outputs.................................................................................................................. 5-345
5.10.5 Resetting ............................................................................................................................. 5-345
5.10.6 Direct inputs and outputs ........................................................................................... 5-346
5.10.7 Teleprotection................................................................................................................... 5-350
5.11 Transducer inputs/outputs.............................................................................. 5-351
5.11.1 DCmA inputs...................................................................................................................... 5-351
5.11.2 RTD inputs .......................................................................................................................... 5-352
5.11.3 DCmA outputs .................................................................................................................. 5-353
5.12 Testing................................................................................................................. 5-357
5.12.1 Test mode function ........................................................................................................5-357
5.12.2 Test mode forcing........................................................................................................... 5-358
5.12.3 Phasor Measurement Unit test values.................................................................. 5-358
5.12.4 Force contact inputs ..................................................................................................... 5-359
5.12.5 Force contact outputs .................................................................................................. 5-360