GE 845 Instruction Manual page 308

PROTECTION
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4–204
matches the number of voltages selected in the setting. The element drops from Pickup
without operation if the measured voltage rise above 102 to 103% of the Pickup value,
before the time for operation is reached.
The minimum voltage setting selects the operating voltage below which the element is
blocked (a setting of "0" allows a dead source to be considered a fault condition).
This element may be used to give a desired time delay operating characteristic versus the
applied voltage (phase to ground or phase to phase for wye VT connection, or phase to
phase for delta VT connection) or as a definite time element. For the inverse time setpoint,
the undervoltage delay setpoint defines a family of curves as described in
Curves on page 4-203.
Path:
Setpoints > Protection > Group 1(6) > Voltage Elements > Phase UV 1(2)
FUNCTION
Range: Disabled, Trip, Alarm, Latched Alarm, Configurable
Default: Disabled
MODE
Range: Phase to Ground, Phase to Phase
Default: Phase to Ground
This setting provides the selection of phase to ground and phase to phase voltages for a
Wye VT connection (phase to phase for delta connected VT connection).
Only phase to phase mode shall be selected when the delta is programmed for phase VT
connection under System/Voltage Sensing.
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
Undervoltage