GE 845 Instruction Manual page 315

CHAPTER 4: SETPOINTS
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845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Only Phase to Phase mode shall be selected when the delta is programmed for Phase VT
connection under System/Voltage Sensing.
PICKUP
Range: 0.02 to 3.00 x VT in steps of 0.01 x VT
Default: 1.50 x VT
The setting sets the phase overvoltage pickup level to specified per times VT.
For example, a Pickup setting of 1.10 x VT with 13800:115 VT translates into 15.18kV. If
the mode selection is phase to phase and Setpoints/ System Setup/ Voltage Sensing/
Phase VT Connection selection is Wye, the previous example translates to the phase to
phase voltage value of 15.18kV x 1.732 = 26.29kV.
PHASES FOR OPERATION
Range: Any One, Any Two, All Three
Default: Any One
The setting defines the number of voltages required for operation of the Phase OV
protection function.
PICKUP DELAY
Range: 0.000 to 6000.000 s in steps of 0.001 s
Default: 1.000 s
DROPOUT DELAY
Range: 0.000 to 6000.000 s in steps of 0.001 s
Default: 1.000 s
BLOCK
Range: Off, Any operand from the list of FlexLogic operands
Default: Off
RELAYS
Range: Do Not Operate, Operate
Default: Do Not Operate
EVENTS
Range: Enabled, Disabled
Default: Enabled
TARGETS
Range: Disabled, Self-reset, Latched
Default: Self-reset
PROTECTION
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