GE MI-869 Instruction Manual page 330

PROTECTION
4–212
MINIMUM VOLTAGE
Range: 0.00 to 1.50 x VT in steps of 0.01 x VT
Default: 0.20 x VT
This setting sets the minimum operating voltage for the undervoltage Pickup level
specified per times VT.
For example, a PKP setting of 0.20 x VT with 13800:115 VT translates into 2.76kV (or 23V
secondary).
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 2.76kV x 1.732 = 4.78kV.
PHASES FOR OPERATION
Range: Any One, Any Two, All Three
Default: Any One
This setting defines the number of voltages required for operation of the Phase UV
protection function.
UNDERVOLTAGE CURVES
Range: Definite Time, Inverse Time, FlexCurves A/B/C/D
Default: Definite Time
This setting provides the selection of definite time delay or time delay inverse
undervoltage curves, or FlexCurves. In the case of FlexCurves, the voltage ratio used is
reversed. Refer to the equation and note regarding FlexCurves in the previous section
Undervoltage Curves.
PICKUP DELAY
Range: 0.000 to 6000.000 s in steps of 0.001 s
Default: 1.000 s
If Inverse Time is selected as an Undervoltage Curve setpoint, the Pickup Delay value is
loaded to variable D in the curve formula. For more information, refer to the previous
section Undervoltage Curves.
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
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS