GE D90 Plus Instruction Manual page 220

GROUPED PROTECTION ELEMENTS
212
Figure 164: Ground time overcurrent configuration settings
The following settings are available for each ground time overcurrent element.
Function
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the ground time overcurrent 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 ground time overcurrent protection
element.
Input
Range: Phasor, RMS
Default: Phasor
This setting selects how ground current input quantities are interpreted by the D90
Inputs can be selected as fundamental phasor magnitudes or total waveform RMS
magnitudes as required by the application.
Pickup
Range: 0.000 to 30.000 pu in steps of 0.001
Default: 1.000 pu
This setting specifies the ground time overcurrent pickup level in per-unit values.
Curve
Range: IEEE Mod Inv, IEEE Very Inv, IEEE Ext Inv, IEC Curve A, IEC Curve B, IEC Curve C, IEC
Short Inv, IAC Ext Inv, IAC Very Inv, IAC Inverse, IAC Short Inv, I2t, Definite Time, FlexCurve A,
FlexCurve B, FlexCurve C, FlexCurve D
Default: IEEE Mod Inv
This setting selects the inverse time overcurrent curve style.
TD Multiplier
Range: 0.00 to 600.00 in steps of 0.01
Default: 1.00
This setting specifies a multiple of the base curve shape specified by the
Programming this value to zero results in an instantaneous response to all current levels
above pickup.
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 7: PROTECTION
Plus
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Curve setting.