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3.2
3.3
3.3.1
Autorecloser (AR)
ServiceReport/Functions/AutoRecloser/AutoRecloser n/Counters
4.
The AR01-CBCLOSED breaker position, the commands Trip and
Closing, AR01-CLOSECB, and other signals should preferably be ar-
ranged for event recording provided with time measurements.
Otherwise, a separate timer or recorder can be used to check the AR open
time and other timers.
Checking the AR functionality
1.
Ensure that the voltage inputs to Synchro-check, when applied, give
accepted conditions at open breaker (BR).
They can, for example, be Live busbar and Dead line.
2.
Set the operation at On.
3.
Make a BR pickup by a closing pulse, the SC-pulse.
4.
Close SRY, Breaker ready and leave it closed.
5.
Inject AC quantities to give a trip and start AR in phase L1.
Observe or record the BR operation. The BR relay should trip and re-
close. After the closing operation, the SRY switch could be opened for
about 5 s and then closed.
The AR open time and the operating sequence should be checked, for ex-
ample, in the event recording.
Check the operate indications and the operate counters.
Should the operation not be as expected, the reason must be investigated.
It could be due to an AR Off state or wrong program selection, or not ac-
cepted synchro-check conditions.
Checking the reclosing condition
The number of cases can be varied according to the application. Examples of selection cases are:
Checking the Inhibit signal
1.
Check that the function is operative and that the breaker conditions
are okay.
2.
Apply an AR01-INHIBIT input signal and start the reclosing function.
3.
Check that there is no reclosing.
Chapter 13
Verifying settings by secondary
injection
91
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