Autoreclose mode is programmed for three-pole operation
The shot counter is not at 0; that is, the scheme is not in the reset state. This ensures a second trip will be three-pole
when reclosing onto a permanent single phase fault.
1.25 cycles after the single-pole reclose is initiated by the
ZONE 1 EXTENT:
The zone 1 extension philosophy here is to apply an overreaching zone permanently as long as the relay is ready to
reclose, and reduce the reach when reclosing. Another zone 1 extension approach is to operate normally from an under-
reaching zone, and use an overreaching distance zone when reclosing the line with the other line end open. This philoso-
phy could be programmed via the line pickup scheme.
The "Extended Zone 1" is 0 when autoreclose is in lockout or disabled and 1 when autoreclose is in reset.
When "Extended Zone 1" is 0, the distance functions shall be set to normal underreach Zone 1 setting.
When "Extended Zone 1" is 1, the distance functions may be set to Extended Zone 1 Reach, which is an overreaching
During a reclose cycle, "Extended Zone 1" goes to 0 as soon as the first
) and remains 0 until the recloser goes back to reset.
COUNT > 0
USE OF SETTINGS:
The single-phase autoreclose settings are described below.
AR MODE: This setting selects the Autoreclose operating mode, which functions in conjunction with signals received
at the initiation inputs as described previously.
AR MAX NUMBER OF SHOTS: This setting specifies the number of reclosures that can be attempted before reclo-
sure goes to lockout when the fault is permanent.
AR INITIATE MODE: This setting selects the autoreclose initiation mode. When selected as "Protection AND CB", the
autoreclose element will be initiated by protection operation and will begin incrementing the autoreclose dead time
timer when a circuit breaker is open. Breaker status is determined from breaker auxiliary contacts which should be cor-
rectly configured in breaker settings. In "Protection only" initiation mode, the autoreclose element will be initiated by
protection operation and will begin incrementing the dead time when protection resets, without the need of breaker
AR BLOCK BKR1: This input selects an operand that will block the reclose command for breaker 1. This condition can
be for example: breaker low air pressure, reclose in progress on another line (for the central breaker in a breaker and
a half arrangement), or a sum of conditions combined in FlexLogic™.
AR CLOSE TIME BKR1:This setting represents the closing time for the breaker 1 from the moment the "Close" com-
mand is sent to the moment the contacts are closed.
AR BKR MAN CLOSE: This setting selects a FlexLogic™ operand that represents manual close command to a
breaker associated with the autoreclose scheme.
AR BLK TIME UPON MAN CLS: The autoreclose scheme can be disabled for a programmable time delay after an
associated circuit breaker is manually commanded to close, preventing reclosing onto an existing fault such as
grounds on the line. This delay must be longer than the slowest expected trip from any protection not blocked after
manual closing. If the autoreclose scheme is not initiated after a manual close and this time expires the autoreclose
scheme is set to the reset state.
AR 1P INIT: This setting selects a FlexLogic™ operand that is intended to initiate single-pole autoreclosure.
AR 3P INIT: This setting selects a FlexLogic™ operand that is intended to initiate three-pole autoreclosure, first timer
) that can be used for a high-speed autoreclosure.
AR 3P DEAD TIME 1
AR 3P TD INIT: This setting selects a FlexLogic™ operand intended to initiate three-pole autoreclosure. second timer
) can be used for a time-delay autoreclosure. If the operand assigned to this setting and the AR
AR 3P DEAD TIME 2
setting are asserted simultaneously, then autoreclose will not activate the first and second shot timers at the same
time. Instead, the priority is given to the
AR MULTI-P FAULT: This setting selects a FlexLogic™ operand that indicates a multi-phase fault. The operand value
should be zero for single-phase to ground faults.
AR 1P INIT
AR 3P INIT
L60 Line Phase Comparison System
5.6 CONTROL ELEMENTS
signal is issued (