GE C60 Instruction Manual page 137

5 SETTINGS
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, Bus Differential Protection, etc.). If the block signal is present before autoreclose
scheme initiation the AR DISABLED FlexLogic™ operand will be set. If the block signal occurs when the scheme is in the
RIP state the scheme will be sent to Lockout.
AR PAUSE: The pause input offers the ability to freeze the autoreclose cycle until the pause signal disappears. This may
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. 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 the it is disconnected from the line. In this situation, the reclose scheme is "paused" until the transformer is discon-
nected.
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 BKR2 signal is sent. If all conditions allow-
ing a breaker closure are not satisfied when this time expires, the scheme goes to "Lockout". The minimum permissible set-
ting is established by the "3-P Dead Time 2" timer setting. Settings beyond this will 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 con-
tinue and/or for the AR BKR1(2) BLK signal to disappear and allow the AR CLOSE BKR1(2) signal to be sent.
AR BLOCK BKR2: This input selects an operand that will block the reclose command for breaker No.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 BKR2 MNL CLOSE: This setting selects an operand asserted when breaker No. 2 is manually commanded to close.
AR CLOSE TIME BKR2: This setting represents the closing time for the breaker No. 2 from the moment the "Close" com-
mand is sent to the moment the contacts are closed.
AR TRANSFER 1 TO 2: This setting establishes how the scheme performs when the breaker closing sequence is 1-2 and
breaker No. 1 is blocked. When set to "YES" the closing command will be transferred direct to breaker No. 2 without waiting
the transfer time. When set to "NO" the closing command will be blocked by the AR BKR1 BLK signal and the scheme will
be sent to LOCKOUT by the incomplete sequence timer.
AR TRANSFER 2 TO 1: This setting establishes how the scheme performs when the breaker closing sequence is 2-1 and
breaker No. 2 is blocked. When set to "YES" the closing command will be transferred direct to breaker No. 1 without waiting
the transfer time. When set to "NO" the closing command will be blocked by the AR BKR2 BLK signal and the scheme will
be sent to LOCKOUT by the incomplete sequence timer.
AR BKR1 FAIL OPTION: This setting establishes how the scheme performs when the breaker closing sequence is 1-2 and
breaker No. 1 has failed to close. When set to "Continue" the closing command will be transferred to breaker No. 2 which
will continue the reclosing cycle until successful (the scheme will reset) or unsuccessful (the scheme will go to Lockout).
When set to "Lockout" the scheme will go to lockout without attempting to reclose breaker No. 2.
AR BKR2 FAIL OPTION: This setting establishes how the scheme performs when the breaker closing sequence is 2-1 and
breaker No. 2 has failed to close. When set to "Continue" the closing command will be transferred to breaker No. 1 which
will continue the reclosing cycle until successful (the scheme will reset) or unsuccessful (the scheme will go to Lockout).
When set to "Lockout" the scheme will go to lockout without attempting to reclose breaker No. 1.
AR 1-P DEAD TIME: Set this intentional delay longer than the estimated de-ionizing time following the first single-pole trip.
AR BREAKER SEQUENCE: This setting selects the breakers reclose sequence:
1 = reclose breaker 1 only
2 = reclose breaker 2 only
1&2 = reclose both breakers simultaneously
1-2 = reclose breakers sequentially; breaker No. 1 first
2-1 = reclose breakers sequentially; breaker No. 2 first
AR TRANSFER TIME: The transfer time is used only for breaker closing sequence 1-2 or 2-1, when the two breakers are
reclosed sequentially. The transfer timer is initiated by a close signal to the first breaker. The transfer timer transfers the
reclose signal from the breaker selected to close first to the second breaker. The time delay setting is based on the maxi-
mum time interval between the autoreclose signal and the protection trip contact closure assuming a permanent fault
(unsuccessful reclose). Therefore, the minimum setting is equal to the maximum breaker closing time plus the maximum
line protection operating time plus a suitable margin. This setting will prevent the autoreclose scheme from transferring the
close signal to the second breaker unless a successful reclose of the first breaker occurs.
GE Multilin C60 Breaker Management Relay
5.6 CONTROL ELEMENTS
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