5-326 L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUALCONTROL ELEMENTS CHAPTER 5: SETTINGS5The 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 four reclosingattempts. The second, third, and fourth attempts always perform three-pole reclosing and have independent dead timedelays.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 reclose with either the single-pole or three-pole dead time according to the fault type and reclose mode; the secondbreaker should follow the successful reclosure of the first breaker. When reclosing simultaneously, for the first shot bothbreakers should reclose with either the single-pole or three-pole dead time, according to the fault type and the reclosemode.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 multi-phase faults. The autoreclose scheme has five operating states.Table 5-40: Autoreclose statesAutoreclose programsThe autorecloser provides four programs that can cause from one to four reclose attempts (shots). After the first shot, allsubsequent recloses are always three-pole. If the maximum number of shots selected is “1” (only one reclose attempt) andthe fault is persistent, after the first reclose the scheme goes to lockout upon another Initiate signal.For the three-pole reclose programs (modes 3 and 4), an AR FORCE 3-P FlexLogic operand is set. This operand can be used inconnection with the tripping logic to cause a three-pole trip for single-phase faults. AR TRANSFER 1 TO 2:NoRange: Yes, No AR TRANSFER 2 TO 1:NoRange: Yes, No AR BKR1 FAIL OPTION:ContinueRange: Continue, Lockout AR BKR2 FAIL OPTION:ContinueRange: Continue, Lockout AR 1-P DEAD TIME:1.00 sRange: 0 to 655.35 s in steps of 0.01 AR BKR SEQUENCE:1-2Range: 1, 2, 1&2, 1–2, 2–1 AR TRANSFER TIME:4.00 sRange: 0 to 655.35 s in steps of 0.01 AR BUS FLT INIT:OffRange: FlexLogic operand AR EVENT:DisabledRange: Enabled, DisabledState CharacteristicEnabled 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 received
