GE 845 Instruction Manual page 344

PROTECTION
NOTE:
4–240
Path:
Setpoints > Protection > Group 1(6) > Frequency > Overfrequency 1(2)
FUNCTION
Range: Disabled, Trip, Alarm, Latched Alarm, Configurable
Default: Disabled
FREQUENCY INPUT
Range: J2-3VT, J2-Vx
Default: J2-3VT
PICKUP
Range: 20.00 to 65.00 Hz in steps of 0.01 Hz
Default: 60.5 Hz
PICKUP DELAY
Range: 0.000 to 6000.000 s in steps of 0.001 s
Default: 2.000 s
DROPOUT DELAY
Range: 0.000 to 6000.000 s in steps of 0.001 s
Default: 2.000 s
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.
If the 3-phase VT uses a delta connection and FREQUENCY INPUT is set to J2-3VT, 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.
845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS