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Automatic reclosing function (AR)
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The open time for the three pole delayed auto-reclosing shots can be set individually
(t2, t3 and t4). This setting can in some cases be restricted by national regulations.
In case of reclosing based on synchrocheck a maximum wait time (tSync) can be set. If
the synchrocheck does not allow reclosing within this set time there will be no autore-
closing. This setting must be matched against the setting of the synchrocheck function.
The operate time of the synchrocheck is mainly dependent on the setting angle differ-
ence. A typical operation time is about 200 ms. If the system will start to oscillate during
the dead time, there can be some time before the synchronizing quantities can be ac-
cepted for reclosing. This can be checked by means of dynamic simulations. As a base
recommendation tSync can be set to 2.0 s.
The breaker closing pulse length (tPulse) can be chosen with some margin longer that
the shortest allowed pulse for the breaker (see breaker data).
The tReclaim setting must be chosen so that all autoreclosing shots can be completed.
The setting tTrip is used for blocking of autoreclosing in case of long trip duration. This
can be the consequence of an unwanted permanent trip signal or a breaker failure.
In case of one breaker only priority none is chosen.
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