GE D90 Plus Instruction Manual page 236

GROUPED PROTECTION ELEMENTS
228
The neutral overvoltage element can provide a time-delayed operating characteristic
versus the applied voltage (initialized from FlexCurves™ A, B, or C) or be used as a definite
time element. The source assigned to this element must be configured for a phase VT.
VT errors and normal voltage unbalance must be considered when setting this element.
This function requires the VTs to be wye-connected.
Select the Settings > Protection > Elements > Group 1 > Voltage > Neutral OV menu item
to open the neutral overvoltage configuration window.
Figure 180: Neutral overvoltage configuration settings
The following settings are available for each neutral overvoltage element.
Function
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the neutral overvoltage protection element.
Source
Range: LINE (SRC 1), BKR 1 (SRC 2), BKR 2 (SRC 3)
Default: LINE (SRC 1)
This setting selects the signal source for the neutral overvoltage protection element.
Pickup
Range: 0.000 to 1.250 pu in steps of 0.001
Default: 0.300 pu
This setting specifies the neutral overvoltage pickup level in per-unit values.
Curve
Range: Definite Time, FlexCurve A, FlexCurve B, FlexCurve C
Default: Definite Time
This setting specifies the neutral overvoltage pickup level in per-unit values.
Pickup Delay
Range: 0.00 to 600.00 seconds in steps of 0.01
Default: 1.00 seconds
This setting specifies the minimum operating time of the neutral overvoltage element.
This setting applies only if the
Reset Delay
Range: 0.00 to 600.00 seconds in steps of 0.01
Default: 1.00 seconds
This setting specifies the minimum reset time of the neutral overvoltage element.
Curve setting is "Definite Time".
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION