12.2.2.6 Long trip signal M12391-117 v3In normal circumstances the trip command resets quickly because of fault clearance. The usercan set a maximum trip pulse durationtTrip.IfExtended t1=Off, a long trip signal interruptsthe reclosing sequence in the same way as a signal to input INHIBIT. IfExtend t1=On the longtrip time inhibit is disabled andExtend t1 is used instead.12.2.2.7 Maximum number of reclosing shots M12391-120 v6The maximum number of reclosing shots in an auto-reclosing cycle is selected by the settingparameterNoOfShots. The type of reclosing used at the first reclosing shot is set byparameterARMode. The first alternative is three-phase reclosing. The other alternativesinclude some single-phase or two-phase reclosing. Usually there is no two-phase trippingarranged, and then there will be no two-phase reclosing.The decision for single and 3 phase trip is also made in the tripping logic (SMPTTRC) functionblock where the setting3Ph, 1/3Ph (or1/2/3Ph) is selected.12.2.2.8ARMode=3ph, (normal setting for a single 3 phase shot) M12391-124 v43-phase reclosing, one to five shots according to settingNoOfShots. The output Preparethree-phase trip PREP3P is always set (high). A trip operation is made as a three-phase trip atall types of fault. The reclosing is as a three-phase Reclosing as in mode 1/2/3ph describedbelow. All signals, blockings, inhibits, timers, requirements and so on. are the same as in theexample described below.12.2.2.9ARMode=1/2/3ph M12391-127 v71-phase, 2-phase or 3-phase reclosing first shot, followed by 3-phase reclosing shots, ifselected. Here, the auto-reclosing function is assumed to be "On" and "Ready". The breaker isclosed and the operation gear ready (operating energy stored). Input START (or STARTHS) isreceived and sealed-in. The output READY is reset (set to false). Output ACTIVE is set.• If inputs TR2P is low and TR3P is low (1-phase trip): The timer for 1-phase reclosing opentime is started and the output 1PT1 (1-phase reclosing in progress) is activated. It can beused to suppress pole disagreement and earth-fault protection trip during the 1-phaseopen interval.• If TR2P is high and TR3P is low (2-phase trip): The timer for 2-phase reclosing open time isstarted and the output 2PT1 (2-phase reclosing in progress) is activated.• If TR3P is high (3-phase trip): The timer for 3-phase auto-reclosing open time,t1 3Ph isstarted and output 3PT1 (3-phase auto-reclosing shot 1 in progress) is set.• If STARTHS is high (3-phase trip): The timer for 3-phase auto-reclosing open time, t13PhHS is started and output 3PT1 (3-phase auto-reclosing shot 1 in progress) is set.While any of the auto-reclosing open time timers are running, the output INPROGR is activated.When the "open time" timer runs out, the respective internal signal is transmitted to theoutput module for further checks and to issue a closing command to the circuit breaker.When a CB closing command is issued the output prepare 3-phase trip is set. When issuing aCB closing command a “reclaim” timertReclaim is started. If no tripping takes place duringthat time the auto-reclosing function resets to the “Ready” state and the signal ACTIVE resets.If the first reclosing shot fails, a 3-phase trip will be initiated and 3-phase reclosing can follow,if selected.1MRK 505 363-UEN A Section 12Control221Application manual
