CHAPTER 5: SETTINGS
CONTROL ELEMENTS
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
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AR MULTI-P FAULT
— This setting selects a FlexLogic operand that indicates a multi-phase fault. Set the operand value to
zero for single-phase to ground faults.
BKR ONE POLE OPEN
— This setting selects a FlexLogic operand that indicates that the breaker has opened correctly
following a single phase to ground fault and the autoreclose scheme can start timing the single pole dead time (for 1-2
reclose sequence for example, breaker 1 trips single pole and breaker 2 trips 3 pole).
The scheme has a pre-wired input that indicates breaker status.
BKR 3 POLE OPEN
— This setting selects a FlexLogic operand that indicates that the breaker has opened three pole and the
autoreclose scheme can start timing the three pole dead time. The scheme has a pre-wired input that indicates breaker
status.
AR 3-P DEAD TIME 1
— This is the dead time following the first three pole trip. This intentional delay can be used for a high-
speed three-pole autoreclose. Set it longer than the estimated de-ionizing time following the three-pole trip.
AR 3-P DEAD TIME 2
— This is the dead time following the second three-pole trip or initiated by the
AR 3P TD INIT
input. This
intentional delay is typically used for a time delayed three-pole autoreclose (as opposed to high speed three-pole
autoreclose).
AR 3-P DEAD TIME 3
— This setting represents the dead time following the third three-pole trip.
AR 3-P DEAD TIME 4
— This setting represents the dead time following the fourth three-pole trip.
AR EXTEND DEAD T 1
— This setting selects an operand that adapts the duration of the dead time for the first shot to the
possibility of non-simultaneous tripping at the two line ends. Typically this is the operand set when the communication
channel is out of service.
AR DEAD TIME 1 EXTENSION
— This timer sets the length of the dead time 1 extension for possible non-simultaneous tripping
of the two ends of the line.
AR RESET
— This setting selects the operand that forces the autoreclose scheme from any state to reset. Typically this is a
manual reset from lockout, local, or remote.
AR RESET TIME
— A reset timer output resets the recloser following a successful reclosure sequence. The setting is based on
the breaker time that is the minimum time required between successive reclose sequences.
AR BKR CLOSED
— This setting selects an operand that indicates that the breakers are closed at the end of the reset time
and the scheme can reset.
AR BLOCK
— This setting selects the operand that blocks the autoreclose scheme (it can be a sum of conditions, such as
time delayed tripping, breaker failure, and bus differential protection. If the block signal is present before autoreclose
scheme initiation, the
AR DISABLED
FlexLogic operand is set. If the block signal occurs when the scheme is in the RIP state,
the scheme is sent to lockout.
AR PAUSE
— The pause input offers the ability to freeze the autoreclose cycle until the pause signal disappears. This can be
done when a trip occurs and simultaneously or previously, some conditions are detected, such as out-of step or loss of
guard frequency, or a remote transfer trip signal is received. The pause signal freezes all four dead timers. When the pause
signal disappears, the autoreclose cycle is resumed by continuing the shot timer it left off when paused. This feature can
also be used when a transformer is tapped from the protected line and a reclose is not desirable until it is disconnected
from the line. In this situation, the reclose scheme pauses until the transformer is disconnected.
AR INCOMPLETE SEQ TIME
— This timer is used to set the maximum time interval allowed for a single reclose shot. It is
started whenever a reclosure is initiated and is active until the CLOSE BKR1 or CLOSE BKR2 signal is sent. If all conditions
allowing a breaker closure are not satisfied when this time expires, the scheme goes to “Lockout”. The minimum
permissible setting is established by the
AR 3-P DEAD TIME 2
timer setting. Settings beyond this determine the wait time for
the breaker to open so that the reclose cycle can continue and/or for the AR PAUSE signal to reset and allow the reclose
cycle to continue and/or for the AR BKR1 BLK signal to disappear and allow the AR CLOSE BKR1 signal to be sent.
AR BLOCK BKR2
— This input selects an operand that blocks the reclose command for breaker 2. 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 BKR2
— This setting represents the closing time for the breaker 2 from the moment the 'Close' command is
sent to the moment the breaker contacts are closed in the "Protection AND CB" mode or when Open Pole is reset in the
"Protection only" mode. In the "Protection Only" mode,
AR1 CLOSE BRK 1
is reset if either protection operates again in the
case of the unsuccessful reclose attempt or 20 ms after Open Pole is reset in case of a successful reclosure attempt.
