ABB REO 517, Applications Manual, Page: 185 / 440

175
Automatic reclosing function (AR)
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For the example (see Figures in Function block diagrams and Sequence examples), the
AR function is assumed to be
2Q
and
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. The breaker is closed and the operation
gear ready, manoeuvre spring charged etc.
AR01-START is received and sealed-in at operation of the line protection. The AR01-
READY output is reset (Ready for a new AR cycle).
Immediately after the start-up of the reclosing and tripping of the breaker, the input (see
figure in Function block diagrams) AR01-CBCLOSED is low (possibly also AR01-
CBREADY at type OCO). The AR Open-time timer, t1, keeps on running. At the end
of the set AR open-time, the three-phase AR time-out (see figure in Function block di-
agrams) is activated and goes on to the output module for further checks and to give a
closing command to the circuit breaker.
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A new start of a reclosing cycle is blocked for the reclaim time after the selected number
of reclosing attempts are performed.
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An AR open-time time-out signal is received from a program module. At three-phase
reclosing, a synchro-check and/or energising check or voltage check can be used. It is
possible to use an internal or an external synchro-check function, configured to AR01-
SYNC. If a reclosing without check is preferred, configure the input AR01-SYNC to
FIXD-ON (set to 1).
Another possibility is to set the output from the internal synchro-check function to a
permanently active signal. Set Operation = Release in the synchro-check function. Then
AR01-SYNC is configured to SYNx-AUTOOK.
At confirmation from the synchro-check or if the reclosing is of single-phase type, the
signal passes on.
At AR01-CBREADY signal of the Close-Open (CO) type, it is checked that this signal
is present to allow a reclosing.
The synchrocheck and energizing check must be fulfilled within a certain period of
time, tSync. If it does not, or if the other conditions are not fulfilled, the reclosing is in-
terrupted and blocked.
The Reclaim-timer defines a period from the issue of a reclosing command, after which
the reclosing function is reset. Should a new trip occur within this time, it is treated as
a continuation of the first fault. When a closing command is given (Pulse AR), the re-
claim timer is started.