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Automatic reclosing function (AR)
Line
protection
Operate time
Closed
Circuit
breaker
Open
Auto-reclosing
function
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In a bay with one circuit breaker only, a terminal is normally provided with one AR
function.
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The AR function is a logical function built up from logical elements. It operates in con-
junction with the trip output signals from the line protection functions, the OK to close
output signals from the synchrocheck and energizing check function, and binary input
signals (for circuit breaker position/status, or from other external protection functions).
In the AR logic a number of parameters can be set to adjust the auto-reclosing function
to the desired requirements. Examples are:
Break time
Fault duration
AR open time for breaker
Set AR open time
Operate time
Closing time
Break time
Fault duration
Reclaim time
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