CHAPTER 4: SETPOINTS PROTECTION889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–261PICKUPRange: 20.00 to 65.00 Hz in steps of 0.01 HzDefault: 59 HzPICKUP DELAYRange: 0.000 to 6000.000 s in steps of 0.001 sDefault: 2.000 sDROPOUT DELAYRange: 0.000 to 6000.000 s in steps of 0.001 sDefault: 2.000 sMINIMUM VOLTAGERange: 0.000 to 1.250 x VT in steps of 0.001 x VTDefault: 0.700 x VTThe setting sets the minimum voltage for Underfrequency element operation specifiedper times VT. The setpoint prevents incorrect operation before energization of the sourceto the relay location, and during voltage dips.FASTPATH:If the 3-phase VT uses a delta connection and SIGNAL INPUT is set to Ph VT Bnk1-J2, thepositive sequence voltage is used as the supervision voltage. In such condition, the truesupervision level is internally changed to 1/sqrt(3) of the user setting since the base of VThere is the phase-phase voltage.MINIMUM CURRENTRange: 0.000 to 30.000 x CT in steps of 0.001 x CTDefault: 0.200 x CTThe setting sets the minimum value of current required on any phase to allow theUnderfrequency element to operate. The setpoint is used to prevent underfrequencytripping during periods of light load, when this action would have an insignificant effecton the system. A setting of zero is suspend current supervision.BLOCKRange: Off, Any FlexLogic operandDefault: OffOUTPUT RELAY XFor details see Common Setpoints.EVENTSRange: Enabled, DisabledDefault: EnabledTARGETSRange: Disabled, Self-reset, LatchedDefault: Self-reset
