6–142 850 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
FREQUENCY ELEMENTS CHAPTER 6: PROTECTION SETPOINTS
MINIMUM VOLTAGE
Range: 0.000 to 1.250 x VT in steps of 0.001 x VT
Default: 0.700 x VT
The setting sets the minimum voltage for Overfrequency element operation specified
per times VT.
NOTE:
If the 3-phase VT uses a delta connection and FREQUENCY INPUT is set to Ph VT Bnk1-J2,
the positive sequence voltage is used as the supervision voltage. In such condition, the true
supervision level is internally changed to 1/sqrt(3) of the user setting since the base of VT
here is the phase-phase voltage.
BLOCK
Range: Off, Any FlexLogic operand
Default: Off
OUTPUT RELAY X
For details see Common Setpoints.
EVENTS
Range: Enabled, Disabled
Default: Enabled
TARGETS
Range: Disabled, Self-reset, Latched
Default: Self-reset
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