ABB REO 517, Applications Manual

Page: 186 / 440

176
Automatic reclosing function (AR)
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There is an AR State Control, see Function block diagrams, to track the actual state in
the reclosing sequence.
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The circuit breaker closing command, AR01-CLOSECB, is made as a pulse with a du-
ration, set by the tPulse parameter. For circuit breakers without an anti-pumping func-
tion, the closing-pulse-cutting described below can be used. It is selected by means of
the CutPulse parameter (set to On). In case of a new trip pulse, the closing pulse will be
cut (interrupted). But the minimum length of the closing pulse is always 50 ms.
At the issue of a reclosing command, the associated reclosing operation counter is also
incremented. There is a counter for each type of reclosing and one for the total number
of reclosings. See Function block diagrams.
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After the reclosing command, the reclaim timer keeps running for the set time. If no
tripping occurs within this time, tReclaim, the auto-reclosing function will be reset. The
circuit breaker remains closed and the operating gear ready (manoeuvre spring is re-
charged). AR01-CBCLOSED = 1 and AR01-CBREADY = 1.
After the reclaim time, the AR state control resets to original rest state, with AR01-SE-
TON = 1, AR01-READY = 1. The other AR01 outputs = 0.
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Normally the signal AR01-UNSUC appears when a new start is received after the last
reclosing attempt has been made. See Function block diagrams. It can be programmed
to appear at any stage of a reclosing sequence by setting the parameter
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On. The UNSUC signal is attained after the time tUnsuc.
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If a new trip takes place after a reclosing attempt and a new AR01-START or AR01-
TRSOTF signal appears, the AR01-UNSUC (Reclosing unsuccessful) is activated. The
timer for the first reclosing attempt (t1) cannot be started.
Depending on the PulseCut parameter setting, the closing command may be shortened
at the second trip command.
After time-out of the reclaim timer, the auto reclosing function resets, but the circuit
breaker remains open (AR01-CBCLOSED = 0, AR01-CBREADY = 1). Thus the re-
closing function is not ready for a new reclosing cycle. See Function block diagrams
and Sequence examples.