vi D60 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUALTABLE OF CONTENTS5.5.6 FlexCurves .......................................................................................................................... 5-1585.5.7 Phasor Measurement Unit.......................................................................................... 5-1655.6 FlexLogic.............................................................................................................. 5-1855.6.1 FlexLogic operands........................................................................................................ 5-1855.6.2 FlexLogic rules.................................................................................................................. 5-2025.6.3 FlexLogic evaluation...................................................................................................... 5-2025.6.4 FlexLogic example.......................................................................................................... 5-2025.6.5 FlexLogic equation editor............................................................................................ 5-2075.6.6 FlexLogic timers............................................................................................................... 5-2075.6.7 FlexElements ..................................................................................................................... 5-2075.6.8 Non-volatile latches....................................................................................................... 5-2125.7 Grouped elements ............................................................................................. 5-2135.7.1 Overview ............................................................................................................................. 5-2135.7.2 Setting group 1................................................................................................................. 5-2145.7.3 Line pickup ......................................................................................................................... 5-2145.7.4 Distance............................................................................................................................... 5-2175.7.5 Power swing detect (ANSI 68).................................................................................... 5-2385.7.6 Load encroachment ...................................................................................................... 5-2475.7.7 Phase current ................................................................................................................... 5-2485.7.8 Neutral current................................................................................................................. 5-2605.7.9 Wattmetric ground fault.............................................................................................. 5-2685.7.10 Ground current ................................................................................................................ 5-2725.7.11 Negative sequence current........................................................................................ 5-2755.7.12 Breaker failure (ANSI 50BF)......................................................................................... 5-2815.7.13 Voltage elements ............................................................................................................ 5-2915.7.14 Sensitive directional power ........................................................................................ 5-3005.8 Control elements ............................................................................................... 5-3035.8.1 Overview ............................................................................................................................. 5-3035.8.2 Trip bus ................................................................................................................................ 5-3035.8.3 Setting groups .................................................................................................................. 5-3055.8.4 Selector switch................................................................................................................. 5-3075.8.5 Trip output.......................................................................................................................... 5-3135.8.6 Underfrequency (ANSI 81U)........................................................................................ 5-3195.8.7 Overfrequency (ANSI 81O) .......................................................................................... 5-3205.8.8 Frequency rate of change (ANSI 81R).................................................................... 5-3215.8.9 Synchrocheck (ANSI 25) ............................................................................................... 5-3225.8.10 Autoreclose (ANSI 79) .................................................................................................... 5-3285.8.11 Digital elements............................................................................................................... 5-3415.8.12 Digital counters................................................................................................................ 5-3445.8.13 Monitoring elements ..................................................................................................... 5-3465.8.14 Pilot schemes.................................................................................................................... 5-3715.9 Inputs/outputs ................................................................................................... 5-3945.9.1 Contact inputs .................................................................................................................. 5-3945.9.2 Virtual inputs ..................................................................................................................... 5-3965.9.3 Contact outputs............................................................................................................... 5-3975.9.4 Virtual outputs.................................................................................................................. 5-4005.9.5 Resetting ............................................................................................................................. 5-4005.9.6 Direct inputs and outputs ........................................................................................... 5-4015.9.7 Teleprotection inputs and outputs ......................................................................... 5-4055.10 Transducer inputs/outputs.............................................................................. 5-4075.10.1 DCmA inputs...................................................................................................................... 5-4075.10.2 RTD inputs .......................................................................................................................... 5-4085.10.3 DCmA outputs .................................................................................................................. 5-4095.11 Testing ................................................................................................................. 5-4135.11.1 Test mode function ........................................................................................................ 5-4135.11.2 Test mode forcing........................................................................................................... 5-413