GE c60 Instruction Manual page 381

CHAPTER 5: SETTINGS
— This setting selects a FlexLogic operand intended to initiate three-pole autoreclosure. second timer (
AR 3P TD INIT
) can be used for a time-delay autoreclosure. If the operand assigned to this setting and the
DEAD TIME 2
are asserted simultaneously, then autoreclose does not activate the first and second shot timers at the same time.
Instead, the priority is given to the
— This setting selects a FlexLogic operand that indicates a multi-phase fault. Set the operand value to
AR MULTI-P FAULT
zero for single-phase to ground faults.
— This setting selects a FlexLogic operand that indicates that the breaker has opened correctly
BKR ONE POLE OPEN
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.
— This setting selects a FlexLogic operand that indicates that the breaker has opened three pole and the
BKR 3 POLE OPEN
autoreclose scheme can start timing the three pole dead time. The scheme has a pre-wired input that indicates breaker
status.
— This is the dead time following the first three pole trip. This intentional delay can be used for a high-
AR 3-P DEAD TIME 1
speed three-pole autoreclose. Set it longer than the estimated de-ionizing time following the three-pole trip.
— This is the dead time following the second three-pole trip or initiated by the
AR 3-P DEAD TIME 2
intentional delay is typically used for a time delayed three-pole autoreclose (as opposed to high speed three-pole
autoreclose).
— This setting represents the dead time following the third three-pole trip.
AR 3-P DEAD TIME 3
— This setting represents the dead time following the fourth three-pole trip.
AR 3-P DEAD TIME 4
— This setting selects an operand that adapts the duration of the dead time for the first shot to the
AR EXTEND DEAD T 1
possibility of non-simultaneous tripping at the two line ends. Typically this is the operand set when the communication
channel is out of service.
— This timer sets the length of the dead time 1 extension for possible non-simultaneous tripping
AR DEAD TIME 1 EXTENSION
of the two ends of the line.
— This setting selects the operand that forces the autoreclose scheme from any state to reset. Typically this is a
AR RESET
manual reset from lockout, local, or remote.
— A reset timer output resets the recloser following a successful reclosure sequence. The setting is based on
AR RESET TIME
the breaker time that is the minimum time required between successive reclose sequences.
— This setting selects an operand that indicates that the breakers are closed at the end of the reset time
AR BKR CLOSED
and the scheme can reset.
— This setting selects the operand that blocks the autoreclose scheme (it can be a sum of conditions, such as
AR BLOCK
time delayed tripping, breaker failure, and bus differential protection. If the block signal is present before autoreclose
scheme initiation, the
AR DISABLED
the scheme is sent to lockout.
— The pause input offers the ability to freeze the autoreclose cycle until the pause signal disappears. This can be
AR PAUSE
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. When the pause signal disappears the autoreclose cycle is
resumed. 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.
— This timer is used to set the maximum time interval allowed for a single reclose shot. It is
AR INCOMPLETE SEQ TIME
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
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.
— This input selects an operand that blocks the reclose command for breaker 2. This condition can be for
AR BLOCK BKR2
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.
C60 BREAKER PROTECTION SYSTEM – INSTRUCTION MANUAL
operand.
AR 3P INIT
FlexLogic operand is set. If the block signal occurs when the scheme is in the RIP state,
timer setting. Settings beyond this determine the wait time for
AR 3-P DEAD TIME 2
CONTROL ELEMENTS
AR 3P
setting
AR 3P INIT
input. This
AR 3P TD INIT
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