GE L90 Instruction Manual page 571

CHAPTER 5: SETTINGS
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.
— 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.
— This setting represents the closing time for the breaker 2 from the moment the 'Close' command is
AR CLOSE TIME BKR2
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,
case of the unsuccessful reclose attempt or 20 ms after Open Pole is reset in case of a successful reclosure attempt.
— This setting establishes how the scheme performs when the breaker closing sequence is 1-2 and
AR TRANSFER 1 TO 2
breaker 1 is blocked. When set to "Yes" the closing command is transferred direct to breaker 2 without waiting the transfer
time. When set to "No" the closing command is blocked by the AR BKR1 BLK signal and the scheme will be sent to lockout
by the incomplete sequence timer.
— This setting establishes how the scheme performs when the breaker closing sequence is 2-1 and
AR TRANSFER 2 TO 1
breaker 2 is blocked. When set to "Yes" the closing command is transferred direct to breaker 1 without waiting the transfer
time. When set to "No", the closing command is blocked by the AR BKR2 BLK signal and the scheme is sent to lockout by
the incomplete sequence timer.
— This setting establishes how the scheme performs when the breaker closing sequence is 1-2 and
AR BKR1 FAIL OPTION
Breaker 1 has failed to close. When set to "Continue" the closing command is transferred to breaker 2, which continues the
reclosing cycle until successful (the scheme resets) or unsuccessful (the scheme goes to Lockout). When set to "Lockout"
the scheme goes to lockout without attempting to reclose breaker 2.
— This setting establishes how the scheme performs when the breaker closing sequence is 2-1 and
AR BKR2 FAIL OPTION
Breaker 2 has failed to close. When set to "Continue" the closing command is transferred to breaker 1, which continues the
reclosing cycle until successful (the scheme resets) or unsuccessful (the scheme goes to Lockout). When set to "Lockout"
the scheme goes to lockout without attempting to reclose breaker 1.
— Set this intentional delay longer than the estimated de-ionizing time after the first single-pole trip.
AR 1-P DEAD TIME
— This setting selects the breakers reclose sequence: Select "1" for reclose breaker 1 only, "2" for
AR BREAKER SEQUENCE
reclose breaker 2 only, "1&2" for reclose both breakers simultaneously, "1-2" for reclose breakers sequentially; Breaker 1
first, and "2-1" for reclose breakers sequentially; Breaker 2 first.
— The transfer time is used only for breaker closing sequence 1-2 or 2-1, when the two breakers are
AR TRANSFER TIME
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
maximum 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 prevents the autoreclose scheme from
transferring the close signal to the second breaker unless a successful reclose of the first breaker occurs.
— This setting is used in breaker-and-a-half applications to allow the autoreclose control function to
AR BUS FLT INIT
perform reclosing with only one breaker previously opened by bus protection. For line faults, both breakers must open for
the autoreclose reclosing cycles to take effect.
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL
timer setting. Settings beyond this determine the wait time for
AR 3-P DEAD TIME 2
AR1 CLOSE BRK 1
is reset if either protection operates again in the
CONTROL ELEMENTS
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