GE D90 Plus Instruction Manual page 195

CHAPTER 7: PROTECTION
PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Phase IOC Line Pickup
Range: 0.000 to 30.000 pu in steps of 0.001
Default: 1.000 pu
This setting specifies the level of line current required to declare a line pickup operation
when the line is re-energized.
Undervoltage Pickup
Range: 0.000 to 3.000 pu in steps of 0.001
Default: 0.700 pu
This setting specifies the level of line voltage required to declare that the line is de-
energized, thereby arming the line pickup protection. The overcurrent and distance
elements are supervised by the arming logic.
Line End Open Pickup Delay
Range: 0.000 to 65.535 seconds in steps of 0.001
Default: 0.150 seconds
This setting specifies the time during which the line is de-energized before the line
pickup logic is armed.
Line End Open Reset Delay
Range: 0.000 to 65.535 seconds in steps of 0.001
Default: 0.090 seconds
This setting specifies the time during which the line pickup logic remains armed once the
line has been re-energized.
Overvoltage Pickup Delay
Range: 0.000 to 65.535 seconds in steps of 0.001
Default: 0.040 seconds
This setting specifies the time during which the line pickup logic remains armed once the
line voltage has returned to normal.
Autoreclose Coordination Bypass
Range: Enabled, Disabled
Default: Enabled
The coordination timer allows the overcurrent detector to be set below the expected
load current seen after reclose. When this setting is enabled (the default value), the
coordination timer is bypassed. Disable this setting (removing the bypass and inserting
the timer) if high speed autoreclosure is employed.
Autoreclose Coordination Pickup Delay
Range: 0.000 to 65.535 seconds in steps of 0.001
Default: 0.045 seconds
If the setting of the overcurrent detector is less than the load current, then it picks up
during a normal re-energization of the line. This setting delays the assertion of the
operand, allowing the recovery of the line voltage to block the scheme.
PICKUP OP
Autoreclose Coordination Reset Delay
Range: 0.000 to 65.535 seconds in steps of 0.001
Default: 0.005 seconds
This setting extends the assertion of the line pickup output when autoreclose
coordination is not bypassed.
GROUPED PROTECTION ELEMENTS
LINE
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