Technical description
5 Control functions
5.7 Auto-reclose function (79)
VM259.EN007
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A trip signal from the protection stage can be used as a backup.
Configure the start signal of the protection stage to initiate the
AR function. If something fails in the AR function, the trip
signal of the protection stage will open the CB. The delay
setting for the protection stage should be longer than the AR
start delay and discrimination time.
If a critical signal is used to interrupt an AR sequence, the
discrimination time setting should be long enough for the
critical stage, usually at least 100 ms.
Manual closing
When CB is closed manually with the local panel, remote bus,
digital inputs etc, AR will function as follows:
Firmware
version
Functioning
>= 5.31
Reclaim-state is activated. Within the reclaim
time all AR requests are ignored. It is up to
protection stages to take care of tripping. Trip
signals of protection stages must be connected to
a trip relay in the output matrix.
< 5.31
Reclaim-state is activated. Within the reclaim
time any AR request (1…4) will cause final
tripping.
Manual opening
Manual CB open command during AR sequence will stop the
sequence and leaves the CB open.
Reclaim time setting
Firmware
version
Settings
>= 5.53
Use shot specific reclaim time : No
Reclaim time setting defines reclaim time
between different shots during sequence and also
reclaim time after manual closing. AR works
exactly like in older firmwares.
Use shot specific reclaim time : Yes
Reclaim time setting defines reclaim time only
for manual control. Reclaim time between
different shots is defined by shot specific reclaim
time settings.
< 5.53
Reclaim time setting defines reclaim time
between different shots during sequence and also
reclaim time after manual closing.