GE D90 Plus - Page 266

256 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
GROUPED PROTECTION ELEMENTS CHAPTER 7: PROTECTION
Figure 218: Ground instantaneous overcurrent configuration settings
The following settings are available for each ground instantaneous overcurrent element.
Function
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the ground instantaneous 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 instantaneous overcurrent
protection element.
Pickup
Range: 0.000 to 30.000 pu in steps of 0.001
Default: 1.000 pu
This setting specifies the ground instantaneous overcurrent pickup level in per-unit
values.
Delay
Range: 0.00 to 600.00 seconds in steps of 0.01
Default: 0.00 seconds
This setting delays the assertion of the GROUND IOC OP operands. It is used to achieve
timing coordination with other elements and relays.
Reset Delay
Range: 0.00 to 600.00 seconds in steps of 0.01
Default: 0.00 seconds
This setting specifies a delay for the reset of the ground instantaneous overcurrent
element between the operate output state and the return to logic 0 after the input
passes outside the defined pickup range. This setting is used to ensure that the relay
output contacts are closed long enough to ensure reception by downstream equipment.
Block
Range: any FlexLogic operand or shared operand
Default: Off
Assertion of the operand assigned to this setting blocks operation of the ground
instantaneous overcurrent element.