CHAPTER 5: SETTINGS CONTROL ELEMENTSL90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-4015The 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 5-42: 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.Table 5-43: Autoreclose programsThe four autoreclose modes are described as follows:• 1 & 3 Pole — In this mode, the autorecloser starts the AR 1-P DEAD TIME timer for the first shot if the autoreclose issingle-phase initiated, the AR 3-P DEAD TIME 1 timer if the autoreclose is three-pole initiated, and the AR 3-P DEAD TIME 2timer if the autoreclose is three-phase time delay initiated. If two or more shots are enabled, the second, third, andfourth shots are always three-pole and start the AR 3-P DEAD TIME 2(4) timers.• 1 Pole — In this mode, the autorecloser starts the AR 1-P DEAD TIME for the first shot if the fault is single phase. If thefault is three-phase or a three-pole trip on the breaker occurred during the single-pole initiation, the scheme goes tolockout without reclosing. If two or more shots are enabled, the second, third, and fourth shots are always three-poleand start the AR 3-P DEAD TIME 2(4) timers.• 3 Pole-A — In this mode, the autorecloser is initiated only for single phase faults, although the trip is three pole. Theautorecloser uses the AR 3-P DEAD TIME 1 for the first shot if the fault is single phase. If the fault is multi phase thescheme goes to Lockout without reclosing. If two or more shots are enabled, the second, third, and fourth shots arealways three-phase and start the AR 3-P DEAD TIME 2(4) timers.• 3 Pole-B — In this mode, the autorecloser is initiated for any type of fault and starts the AR 3-P DEAD TIME 1 for the firstshot. If the initiating signal is AR 3P TD INIT the scheme starts AR 3-P DEAD TIME 2 for the first shot. If two or more shotsare enabled, the second, third, and fourth shots are always three-phase and start the AR 3-P DEAD TIME 2(4) timers.Basic reclosing operationReclosing operation is determined primarily by the AR MODE and AR BKR SEQUENCE settings. The reclosing sequences arestarted by the initiate inputs. A reclose initiate signal sends the scheme into the reclose-in-progress (RIP) state, assertingthe AR RIP FlexLogic operand. The scheme is latched into the RIP state and resets only when an AR CLS BKR 1 (autoreclosebreaker 1) or AR CLS BKR 2 (autoreclose breaker 2) operand is generated or the scheme goes to the Lockout state.State 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 receivedMode AutoreclosemodeFirst shot Second shot Third shot Fourth shotSingle-phase faultMulti-phasefaultSingle-phase faultMulti-phasefaultSingle-phase faultMulti-phasefaultSingle-phase faultMulti-phasefault1 1 & 3 Pole 1 Pole 3 Pole 3 Pole orLockout3 Pole orLockout3 Pole orLockout3 Pole orLockout3 Pole orLockout3 Pole orLockout2 1 Pole 1 Pole Lockout 3 Pole orLockout3 Pole orLockout3 Pole orLockout3 Pole orLockout3 Pole orLockout3 Pole orLockout3 3 Pole-A 3 Pole Lockout 3 Pole orLockoutLockout 3 Pole orLockoutLockout 3 Pole orLockoutLockout4 3 Pole-B 3 Pole 3 Pole 3 Pole orLockout3 Pole orLockout3 Pole orLockout3 Pole orLockout3 Pole orLockout3 Pole orLockout
