GE L60 Instruction Manual

Also see for L60: Communications manual Communications guide Instruction manual Instruction manual Instruction manual

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5-272 L60 Line Phase Comparison System GE Multilin5.6 CONTROL ELEMENTS 5 SETTINGS5When 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.AR PROGRAMS:The autorecloser provides four programs that can cause from one to four reclose attempts (shots). After the first shot, allsubsequent recloses are always be three-pole. If the maximum number of shots selected is “1” (only one reclose attempt)and the fault is persistent, after the first reclose the scheme goes to lockout upon another Initiate signal.For the 3-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.The four autoreclose modes are described as follows.1. “1 & 3 Pole”: In this mode, the autorecloser starts the AR 1-P DEAD TIME timer for the first shot if the autoreclose is sin-gle-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.2. “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. “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 will go 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.4. “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.STATE 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 receivedTable 5–28: AUTORECLOSE PROGRAMSMODE AR MODE FIRST SHOT SECOND SHOT THIRD SHOT FOURTH SHOTSINGLE-PHASEFAULTMULTI-PHASEFAULTSINGLE-PHASEFAULTMULTI-PHASEFAULTSINGLE-PHASEFAULTMULTI-PHASEFAULTSINGLE-PHASEFAULTMULTI-PHASEFAULT1 1 & 3 POLE 1 POLE 3 POLE 3 POLE orLO3 POLE orLO3 POLE orLO3 POLE orLO3 POLE orLO3 POLE orLO2 1 POLE 1 POLE LO 3 POLE orLO3 POLE orLO3 POLE orLO3 POLE orLO3 POLE orLO3 POLE orLO3 3 POLE-A 3 POLE LO 3 POLE orLOLO 3 POLE orLOLO 3 POLE orLOLO4 3 POLE-B 3 POLE 3 POLE 3 POLE orLO3 POLE orLO3 POLE orLO3 POLE orLO3 POLE orLO3 POLE orLO