10.2.6.2 Control of the auto-reclosing open timeThere are settings for three-phase auto-reclosing open time, t1 3Ph to t5 3Ph.10.2.6.3 Long trip signalIn normal circumstances the trip command resets quickly due to fault clearing. Theuser can set a maximum trip pulse duration tTrip. A long trip signal interrupts thereclosing sequence in the same way as a signal to input INHIBIT.Reclosing checks and the reclaim timerWhen dead time has elapsed during the auto-reclosing procedure certain conditionsmust be fulfilled before the CB closing command is issued. To achieve this, signals areexchanged between program modules to check that these conditions are met. In three-phase reclosing a synchronizing and/or energizing check can be used. It is possible touse a synchro-check function in the same physical device or an external one. Therelease signal is configured by connecting to the auto-reclosing function input SYNC.If reclosing without checking is preferred the SYNC input can be set to TRUE (sethigh). Another possibility is to set the output of the synchro-check function to apermanently activated state. At confirmation from the synchro-check, the signalpasses on.By choosing CBReadyType = CO (CB ready for a Close-Open sequence) thereadiness of the circuit breaker is also checked before issuing the CB closingcommand. If the CB has a readiness contact of type CBReadyType = OCO (CB readyfor an Open-Close-Open sequence) this condition may not be complied with after thetripping and at the moment of reclosure. The Open-Close-Open condition washowever checked at the start of the reclosing cycle and it is then likely that the CB isprepared for a Close-Open sequence.The synchro-check or energizing check must be fulfilled within a set time interval,tSync. If it is not, or if other conditions are not met, the reclosing is interrupted andblocked.The reclaim timer defines a time from the issue of the reclosing command, after whichthe reclosing function resets. Should a new trip occur during this time, it is treated asa continuation of the first fault. The reclaim timer is started when the CB closingcommand is given.A number of outputs for Autoreclosing state control keeps track of the actual state inthe reclosing sequence.1MRK 511 287-UEN A Section 10Control231Technical manual
