GE C60 Instruction Manual

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Contents

GE Multilin C60 Breaker Protection System 5-2275 SETTINGS 5.7 CONTROL ELEMENTS5loss of guard frequency, or a remote transfer trip signal is received. When the pause signal disappears the autoreclosecycle is resumed. This feature can also be used when a transformer is tapped from the protected line and a reclose isnot desirable until it is disconnected from the line. In this situation, the reclose scheme is paused until the transformeris disconnected.• AR INCOMPLETE SEQ TIME: This timer is used to set the maximum time interval allowed for a single reclose shot. Itis started whenever a reclosure is initiated and is active until the CLOSE BKR1 or CLOSE BKR2 signal is sent. If all con-ditions allowing a breaker closure are not satisfied when this time expires, the scheme goes to “Lockout”. The mini-mum permissible setting is established by the AR 3-P DEAD TIME 2 timer setting. Settings beyond this will determine thewait time for the breaker to open so that the reclose cycle can continue and/or for the AR PAUSE signal to reset andallow the reclose cycle to continue and/or for the AR BKR1 BLK signal to disappear and allow the AR CLOSE BKR1 signalto be sent.• AR BLOCK BKR2: This input selects an operand that will block the reclose command for breaker 2. This condition canbe for example: breaker low air pressure, reclose in progress on another line (for the central breaker in a breaker anda 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' com-mand is sent to the moment the breaker contacts are closed in the "Protection AND CB" mode or when Open Pole isreset in the "Protection only" mode. In the "Protection Only" mode, AR1 CLOSE BRK 1 is reset if either protection oper-ates again in the case of the unsuccessful reclose attempt or the breaker closes successfully, indicated by the OpenPole reset within a 150 ms window after the close command is issued. Therefore it is important to set AR CLOSE TIMEBRK1 time greater than the maximum expected breaker close time plus at least 150 ms with a "Protection AND CB"mode.• AR TRANSFER 1 TO 2: This setting establishes how the scheme performs when the breaker closing sequence is 1-2and breaker 1 is blocked. When set to “Yes” the closing command will be transferred direct to breaker 2 without waitingthe transfer time. When set to “No” the closing command will be blocked by the AR BKR1 BLK signal and the schemewill 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 2-1and breaker 2 is blocked. When set to “Yes” the closing command will be transferred direct to breaker 1 without waitingthe transfer time. When set to “No”, the closing command will be blocked by the AR BKR2 BLK signal and the schemewill 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 1 has failed to close. When set to “Continue” the closing command will be transferred to breaker 2 whichwill continue the reclosing cycle until successful (the scheme will reset) or unsuccessful (the scheme will go to Lock-out). When set to “Lockout” the scheme will go to lockout without attempting to reclose breaker 2.• AR BKR2 FAIL OPTION: This setting establishes how the scheme performs when the breaker closing sequence is 2-1 and Breaker 2 has failed to close. When set to “Continue” the closing command will be transferred to breaker 1 whichwill continue the reclosing cycle until successful (the scheme will reset) or unsuccessful (the scheme will go to Lock-out). When set to “Lockout” the scheme will go to lockout without attempting to reclose breaker 1.• AR 1-P DEAD TIME: Set this intentional delay longer than the estimated de-ionizing time after the first single-pole trip.• AR BREAKER SEQUENCE: This setting selects the breakers reclose sequence: Select “1” for reclose breaker 1 only,“2” for 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.• AR TRANSFER TIME: The transfer time is used only for breaker closing sequence 1-2 or 2-1, when the two breakersare reclosed sequentially. The transfer timer is initiated by a close signal to the first breaker. The transfer timer trans-fers the reclose signal from the breaker selected to close first to the second breaker. The time delay setting is based onthe maximum time interval between the autoreclose signal and the protection trip contact closure assuming a perma-nent fault (unsuccessful reclose). Therefore, the minimum setting is equal to the maximum breaker closing time plusthe maximum line protection operating time plus a suitable margin. This setting prevents the autoreclose scheme fromtransferring the close signal to the second breaker unless a successful reclose of the first breaker occurs.• AR BUS FLT INIT: This setting is used in breaker-and-a-half applications to allow the autoreclose control function toperform reclosing with only one breaker previously opened by bus protection. For line faults, both breakers must openfor the autoreclose reclosing cycles to take effect.