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GE UR Series Instruction Manual Page 215

Line differential relay.
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5 SETTINGS
MESSAGE
MESSAGE
MESSAGE
MESSAGE
MESSAGE
a) FUNCTION
The autoreclosure feature is intended for use with transmission and distribution lines, in three-pole tripping schemes for sin-
gle breaker applications. Up to four selectable reclosures "shots" are possible prior to locking out. Each shot has an inde-
pendently settable dead time. The protection settings can be changed between shots if so desired, using FlexLogic™.
Logic inputs are available for disabling or blocking the scheme.
Faceplate panel LEDs indicate the state of the autoreclose scheme as follows:
RECLOSE ENABLED: The scheme is enabled and may reclose if initiated.
RECLOSE DISABLED: The scheme is disabled.
RECLOSE IN PROGRESS: An autoreclosure has been initiated but the breaker has not yet been signaled to close.
RECLOSE LOCKED OUT: The scheme has generated the maximum number of breaker closures allowed and, as the
fault persists, will not close the breaker again; known as "Lockout". The scheme may also be sent in "Lockout" when
the incomplete sequence timer times out or when a block signal occurs while in "Reclose in Progress". The scheme
must be reset from Lockout in order to perform reclose for further faults.
RECLOSE ENABLED:
The reclosure scheme is considered enabled when all of the following conditions are true:
The "AR Function" is set to Enabled.
The scheme is not in the "Lockout" state.
The "Block" input is not asserted.
The "AR Block Time Upon Manual Close" timer is not active.
RECLOSE INITIATION:
The autoreclose scheme is initiated by a trip signal from any selected protection feature operand. The scheme is initiated
provided the circuit breaker is in the closed state before protection operation.
RECLOSE IN PROGRESS (RIP):
RIP is set when a reclosing cycle begins following a reclose initiate signal. Once the cycle is successfully initiated, the RIP
signal will seal-in and the scheme will continue through its sequence until one of the following conditions is satisfied:
The close signal is issued when the dead timer times out.
The scheme goes to lockout.
While RIP is active, the scheme checks that the breaker is open and the shot number is below the limit, and then begins
measuring the dead time.
DEAD TIME:
Each of the four possible shots has an independently settable dead time. Two additional timers can be used to increase the
initial set dead times 1 to 4 by a delay equal to
selected settings. This offers enhanced setting flexibility using FlexLogic™ operands to turn the two additional timers "on"
and "off". These operands may possibly include "AR x SHOT CNT =n", "SETTING GROUP ACT x", etc.
GE Power Management
AR1 DELAY 2:
0.000 s
AR1 RESET LOCKOUT
DELAY: 60.000
AR1 RESET TIME:
60.000 s
AR1 INCOMPLETE SEQ
TIME:
5.000 s
AR1 EVENTS:
Disabled
or
AR1 DELAY 1
AR1 DELAY 2
L90 Line Differential Relay
5.6 CONTROL ELEMENTS
Range: 0.00 to 655.35 s in steps of 0.01
Range: 0.00 to 655.35 s in steps of 0.01
Range: 0.00 to 655.35 s in steps of 0.01
Range: 0.00 to 655.35 s in steps of 0.01
Range: Disabled, Enabled
or the sum of these two delays depending on the
5
5-131

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L90

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