CHAPTER 4: SETPOINTS PROTECTION889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–223MINIMUM VOLTAGERange: 0.00 to 1.50 x VT in steps of 0.01 x VTDefault: 0.20 x VTThis setting sets the minimum operating voltage for the undervoltage Pickup levelspecified per times VT.For example, a PKP setting of 0.20 x VT with 13800:115 VT translates into 2.76kV (or 23Vsecondary).If the Mode setting selection is Phase to Phase and the Setpoints/System Setup/VoltageSensing/Phase VT Connection selection is Wye, the previous example translates to aPhase to Phase voltage value of 2.76kV x 1.732 = 4.78kV.PHASES FOR OPERATIONRange: Any One, Any Two, All ThreeDefault: Any OneThis setting defines the number of voltages required for operation of the Phase UVprotection function.UNDERVOLTAGE CURVESRange: Definite Time, Inverse Time, FlexCurves A/B/C/DDefault: Definite TimeThis setting provides the selection of definite time delay or time delay inverseundervoltage curves, or FlexCurves. In the case of FlexCurves, the voltage ratio used isreversed. Refer to the equation and note regarding FlexCurves in the previous sectionUndervoltage Curves.PICKUP DELAYRange: 0.000 to 6000.000 s in steps of 0.001 sDefault: 1.000 sIf Inverse Time is selected as an Undervoltage Curve setpoint, the Pickup Delay value isloaded to variable D in the curve formula. For more information, refer to the previoussection Undervoltage Curves.BLOCKRange: Off, Any FlexLogic operandDefault: OffOUTPUT RELAY XFor details see Common Setpoints.EVENTSRange: Enabled, DisabledDefault: EnabledTARGETSRange: Disabled, Self-reset, LatchedDefault: Self-reset
