P54x/EN OP/La4 Operation
(OP) 5-186
MiCOM P543, P544, P545 & P546
OP
If the protection operates and circuit breaker trips during the reclaim time the relay either
advances to the next shot in the programmed auto-reclose cycle, or, if all programmed
reclose attempts have been made, the circuit breaker goes to lockout. Every time the relay
trips the sequence counter is incremented by 1 and the reclaim time starts again after each
shot, following the Set CB1 Close signal going high again.
For multi-phase faults the auto-reclose logic can be set to allow auto-reclose block for 2 and
3 phase faults or to allow auto-reclose block for 3 phase faults only using the setting
Multi Phase AR in the AUTORECLOSE settings, where the options are Allow Autoclose ,
BAR 2 & 3 ph and BAR 3 Phase.
Figure 116 Auto-reclose timing diagram – single breaker, single fault
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