
vi G60 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
TABLE OF CONTENTS
5.6.2 FlexLogic rules.................................................................................................................. 5-182
5.6.3 FlexLogic evaluation...................................................................................................... 5-182
5.6.4 FlexLogic example..........................................................................................................5-183
5.6.5 FlexLogic equation editor............................................................................................ 5-188
5.6.6 FlexLogic timers............................................................................................................... 5-188
5.6.7 FlexElements ..................................................................................................................... 5-188
5.6.8 Non-volatile latches.......................................................................................................5-193
5.7 Grouped elements .......................................................................................5-194
5.7.1 Overview ............................................................................................................................. 5-194
5.7.2 Setting group 1................................................................................................................. 5-194
5.7.3 Distance............................................................................................................................... 5-195
5.7.4 Power swing detect (ANSI 68).................................................................................... 5-203
5.7.5 Stator differential (ANSI 87S)...................................................................................... 5-212
5.7.6 Phase current ................................................................................................................... 5-215
5.7.7 Neutral current................................................................................................................. 5-227
5.7.8 Ground current ................................................................................................................ 5-235
5.7.9 Negative sequence current........................................................................................ 5-242
5.7.10 Generator unbalance (ANSI 46)................................................................................ 5-246
5.7.11 Split phase protection (ANSI 50P) ............................................................................ 5-248
5.7.12 Breaker failure (ANSI 50BF)......................................................................................... 5-252
5.7.13 Voltage elements ............................................................................................................ 5-262
5.7.14 Loss of excitation (ANSI 40) ........................................................................................ 5-273
5.7.15 Accidental energization (ANSI 50/27) .................................................................... 5-275
5.7.16 Sensitive directional power (ANSI 32) .................................................................... 5-276
5.7.17 Stator ground.................................................................................................................... 5-280
5.7.18 Field ground fault protection..................................................................................... 5-290
5.8 Control elements .........................................................................................5-295
5.8.1 Overview ............................................................................................................................. 5-295
5.8.2 Trip bus ................................................................................................................................ 5-295
5.8.3 Setting groups .................................................................................................................. 5-297
5.8.4 Selector switch................................................................................................................. 5-298
5.8.5 Underfrequency (81U)................................................................................................... 5-305
5.8.6 Overfrequency (ANSI 81O) .......................................................................................... 5-306
5.8.7 Frequency rate of change (ANSI 81R).................................................................... 5-307
5.8.8 Frequency out-of-band accumulation ................................................................. 5-309
5.8.9 Synchrocheck (ANSI 25) ............................................................................................... 5-310
5.8.10 Digital elements............................................................................................................... 5-316
5.8.11 Digital counters................................................................................................................ 5-319
5.8.12 Monitoring elements ..................................................................................................... 5-321
5.9 Inputs/outputs .............................................................................................5-338
5.9.1 Contact inputs.................................................................................................................. 5-338
5.9.2 Virtual inputs..................................................................................................................... 5-340
5.9.3 Contact outputs............................................................................................................... 5-341
5.9.4 Virtual outputs.................................................................................................................. 5-345
5.9.5 Resetting ............................................................................................................................. 5-345
5.9.6 Direct inputs and outputs ........................................................................................... 5-345
5.9.7 Teleprotection inputs and outputs ......................................................................... 5-349
5.10 Transducer inputs/outputs........................................................................5-351
5.10.1 DCmA inputs...................................................................................................................... 5-351
5.10.2 RTD inputs .......................................................................................................................... 5-352
5.10.3 RRTD inputs........................................................................................................................ 5-355
5.10.4 DCmA outputs .................................................................................................................. 5-358
5.11 Testing ...........................................................................................................5-362
5.11.1 Test mode function ........................................................................................................5-362
5.11.2 Test mode forcing........................................................................................................... 5-363
5.11.3 Phasor Measurement Unit test values.................................................................. 5-363