•
Close Inhibit
At the end of the deadtime the autoreclose progresses to Close Inhibit. The line and bus voltage
levels are checked for close conditions in devices with check syncronizing. DLC/DBC time delays and
check sync parameters are applied depending on voltage level and phase and the applicable Check
Sync, System Sync or Close on Zero settings. The state of 79 Block Reclose and Block
Close inputs are also checked. When all conditions are met the Close Pulse is issued.
•
Close Pulse
The CB Close signal is operated. The duration of the signal is defined by the 79 Close CB Pulse
setting. If a protection trip operates during the close pulse, the output 79 Close Onto Fault is
raised, the close pulse output is truncated and the shot number incremented. The autoreclose will return
to Sequence in Progress for the next shot or Lockout if it is the final shot of the sequence. If no
protection operation occurs the autoreclose sequence will progress to the Reclaim state.
•
Reclaim
Following CB close the reclaim time is started (Functions > Control > 52 > CB-n > Reclaim
Timer). If a trip occurs during this time the autoreclose will increment the shot number, return to
Sequence in Progress or Lockout if it is the final shot of the sequence. If the reclaim timer expires
without a protection trip the relay will raise 79 Successful AR and return to In Service. If a further
trip occurs after completion of the reclaim, it is considered to be a new sequence which is started from
the beginning.
Control Functions
7.3 79 Automatic Reclosing
430 Reyrolle 7SR5, Overcurrent Protection Device, Device Manual
C53000-G7040-C014-1, Edition 11.2019
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