CHAPTER 7: PROTECTION GROUPED PROTECTION ELEMENTS
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 239
Function
Range: Enabled, Disabled
Default: Disabled
This setting enables and disables the phase 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 phase 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 phase 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 PHASE 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 phase 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 A, Block B, Block C
Range: any FlexLogic operand or shared operand
Default: Off
Assertion of the operand assigned to these settings blocks’ phases A, B, and C,
respectively, of the phase instantaneous overcurrent element.
Events
Range: Enabled, Disabled
Default: varies with UR
Plus
-series model; see the EnerVista UR
Plus
Setup software
This setting enables and disables the logging of phase instantaneous overcurrent events
in the sequence of events recorder.
The figure shows the logic for the phase instantaneous overcurrent 1 element. The logic is
identical for all phase instantaneous overcurrent elements.
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