GE C60 Instruction Manual

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5-68 C60 Breaker Management Relay GE Multilin5.6 CONTROL ELEMENTS 5 SETTINGS5a) DESCRIPTIONThe autoreclose scheme is intended for use on transmission lines with circuit breakers operated in both the single pole andthree pole modes, in one or two breaker arrangements. The autoreclose scheme provides four programs with differentoperating cycles, depending on the fault type. Each of the four programs can be set to trigger up to two reclosing attempts.The second attempt always performs three pole reclosing and has an independent dead time delay.When used in two breaker applications, the reclosing sequence is selectable. The reclose signal can be sent to oneselected breaker only, to both breakers simultaneously or to both breakers in sequence (one breaker first and then, after adelay to check that the reclose was successful, to the second breaker). When reclosing in sequence, the first breakershould trip and reclose single pole or three pole, according to the fault type and reclose mode; the second breaker shouldalways trip and reclose 3-Pole. When reclosing simultaneously, for the first shot both breakers should trip and reclose eithersingle pole or three pole, according to the fault type and the reclose mode.The signal used to initiate the autoreclose scheme is the trip output from protection. This signal can be single pole trippingfor single phase faults and three phase tripping for multiphase faults.OPERATION:The autoreclose scheme has five operating states, defined below.MESSAGE AR PAUSE:OffRange: FlexLogicô operandMESSAGE AR INCOMPLETE SEQTIME: 5.00 sRange: 0 to 655.35 s in steps of 0.01MESSAGE AR BLOCK BKR2:OffRange: FlexLogicô operandMESSAGE AR CLOSE TIME BKR2:OffRange: FlexLogicô operandMESSAGE AR TRANSFER 1 TO 2:NoRange: Yes, NoMESSAGE AR TRANSFER 2 TO 1:NoRange: Yes, NoMESSAGE AR BKR1 FAIL OPTION:ContinueRange: Continue, LockoutMESSAGE AR BKR2 FAIL OPTION:ContinueRange: Continue, LockoutMESSAGE AR 1-P DEAD TIME:1.00 sRange: 0 to 655.35 s in steps of 0.01MESSAGE AR BKR SEQUENCE:1-2Range: 1, 2, 1&2, 1ñ2, 2ñ1MESSAGE AR TRANSFER TIME:4.00 sRange: 0 to 655.35 s in steps of 0.01MESSAGE AR EVENT:DisabledRange: Enabled, DisabledTable 5ñ14: AUTORECLOSE OPERATIONSTATE CHARACTERISTICSEnabled Scheme is permitted to operateDisabled Scheme is not permitted to operateReset Scheme is permitted to operate and shot count is reset to 0Reclose In Progress Scheme has been initiated but the reclose cycle is not finished (successful or not)Lockout Scheme is not permitted to operate until reset receivedwww . ElectricalPartManuals . com