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GE UR Series Instruction Manual Page 216

Line differential relay.
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5.6 CONTROL ELEMENTS
The autoreclose provides up to maximum 4 selectable shots. Maximum number of shots can be dynamically modified
through the settings
AR1 REDUCE MAX TO 1 (2, 3)
LOCKOUT:
Scheme lockout will block all phases of the reclosing cycle, preventing automatic reclosure, if any of the following condi-
tions occurs:
The maximum shot number was reached.
A "Block" input is in effect (for instance; Breaker Failure, bus differential protection operated, etc.).
The "Incomplete Sequence" timer times out.
The recloser will be latched in the Lockout state until a "Reset from lockout" signal is asserted, either from a manual close
of the breaker or from a manual reset command (local or remote). The reset from lockout can be accomplished:
by operator command
by manually closing the breaker
whenever the breaker has been closed and stays closed for a preset time.
CLOSE:
After the dead time elapses, the scheme issues the close signal. The close signal is latched until the breaker closes or the
scheme goes to Lockout.
RESET TIME:
A reset timer output resets the recloser following a successful reclosure sequence. The reset time is based on the breaker
"reclaim time" which is the minimum time required between successive reclose sequences.
5
b) SETTINGS
AR1 INITIATE:
Selects the FlexLogic™ Operand that initiates the scheme, typically the trip signal from protection.
AR1 BLOCK:
Selects the FlexLogic™ Operand that blocks the Autoreclosure initiate (it could be from the Breaker Failure, Bus differential
protection, etc.).
AR1 MAX NUMBER OF SHOTS:
Specifies the number of reclosures that can be attempted before reclosure goes to "Lockout" because the fault is perma-
nent.
AR1 REDUCE MAX TO 1:
Selects the FlexLogic™ operand that changes the maximum number of shots from the initial setting to 1.
AR1 REDUCE MAX TO 2:
Selects the FlexLogic™ operand that changes the maximum number of shots from the initial setting to 2.
AR1 REDUCE MAX TO 3:
Selects the FlexLogic™ operand that changes the maximum number of shots from the initial setting to 3.
AR1 MANUAL CLOSE:
Selects the logic input set when the breaker is manually closed.
AR1 MNL RST FRM LO:
Selects the FlexLogic™ Operand that resets the autoreclosure from Lockout condition. Typically this is a manual reset from
lockout, local or remote.
AR1 RESET LOCKOUT IF BREAKER CLOSED:
This setting allows the autoreclose scheme to reset from Lockout if the breaker has been manually closed and stays closed
for a preset time. In order for this setting to be effective, the next setting (
disabled.
5-132
, using the appropriate FlexLogic™ operand.
AR1 RESET LOCKOUT ON MANUAL CLOSE
L90 Line Differential Relay
5 SETTINGS
) should be
GE Power Management

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