Operation P54x/EN OP/La4
MiCOM P543, P544, P545 & P546
(OP) 5-191
OP
If the “preferred” leader circuit breaker is not available for auto-reclosing then, provided it is
available for auto-reclose, the “non-preferred” circuit breaker becomes the “active” leader. If
this is the case there will be no follower circuit breaker.
If both circuit breakers are available for auto-reclosing and follower reclosing is enabled, then
the “preferred leader” will be the “active” leader and the “non-preferred” circuit breaker will be
the follower.
5.6.6.4 Auto-reclose mode for leader & follower circuit breaker (P544/P5
46)
The auto-reclose mode for the leader and follower circuit breaker logic is shown in AR
Figure 9(logic diagram supplement).
Once auto-re
closing is enabled, the specific reclosing modes which can be applied to each
circuit breaker are selected.
The auto-reclose function has three operating modes:
Single Phase Auto-reclose (1P)
Three Phase Auto-reclose (3P)
Single/Three Phase Auto-reclose(1/3P)
Single phase reclosing is permitted only for the first shot of an auto-reclose cycle. If two or
more shots are enabled, then, in a multi-shot auto-reclose cycle, the second and subsequent
trips and reclosures will always be three phase.
The settings for the reclosing modes are affected by the number of circuit breakers,
Num CBs, setting in the AUTO-RECLOSE column of the menu.
5.6.6.4.1 Auto-reclose mode with one circuit breaker (P544/P546)
If Num
CBs is set to CB1 Only or CB2 Only, only one circuit breaker will be controlled, and
a setting AR Mode is visible which controls the specific auto-reclosing mode for the active
circuit breaker.
The following setting options are available: AR 1P, AR 1/3P, AR 3P & Opto.
Single phase auto-reclosing of the circuit breaker is permitted if AR Mode is set to AR 1P or
AR 1/3P. Three phase auto-reclosing of the circuit breaker is permitted if AR Mode is set to
AR 3P or AR 1/3P.
If the AR Mode selection is by Opto then the reclose mode for the active circuit breaker is
determined by the status of two DDB inputs: Lead AR 1P (1497) to enable single phase
auto-reclose, and Lead AR 3P (1498) to enable three phase auto-reclose.
5.6.6.4.2 Auto-reclose mode with two circuit breakers (P544/P546)
If Num
CBs is set to Both CB1&CB2 then a setting Lead/Foll ARMode becomes visible
and is used to control the specific reclosing modes that are applied to each circuit breaker.
The options available are :-
L1P F1P
L1P F3P
L3P F3P
L1/3P F1/3P
L1/3P F3P
Opto”
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