5.7 Auto-reclose function (79)
5 Control functions
Technical description
212
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VM259.EN007
Support for 2 circuit breakers (firmware version >= 5.31)
AR function can be configured to handle 2 controllable objects.
Object 1 is always used as CB1 and any other controllable
object can be used as CB2. The object selection for CB2 is made
with Breaker 2 object setting. Switching between the two
objects is done with a digital input, virtual input or virtual
output. AR controls CB2 when the input defined by Input for
selecting CB2 setting is active. Control is changed to another
object only if the current object is not close.
Blocking of AR shots (firmware version >= 5.57)
Each AR shot can be blocked with a digital input, virtual input
or virtual output. Blocking input is selected with Block setting.
When selected input is active the shot is blocked. A blocked
shot is treated like it doesn‘t exist and AR sequence will jump
over it. If the last shot in use is blocked, any AR request during
reclaiming of the previous shot will cause final tripping.
Starting AR sequence (firmware version >= 5.1)
Each AR request has own separate starting delay counter. The
one which starting delay has elapsed first will be selected. If
more than one delay elapses at the same time, an AR request of
the highest priority is selected. AR1 has the highest priority
and AR4 has the lowest priority. First shot is selected according
to the AR request. Next AR opens the CB and starts counting
dead time.
Starting AR sequence (firmware version < 5.1)
If more than one AR requests are active, a request of the
highest priority is selected. AR1 has the highest priority and
AR4 has the lowest priority. After the start delay of shot 1 has
elapsed, AR opens the CB and starts counting dead time.
Starting sequence at shot 2…5 & skipping of AR shots
(firmware version >= 5.1)
Each AR request line can be enabled to any combination of the
5 shots. For example making a sequence of Shot 2 and Shot 4
for AR request 1 is done by enabling AR1 only for those two
shots.
NOTE: If AR sequence is started at shot 2...5 the starting delay is taken from the
discrimination time setting of the previous shot. For example if Shot 3 is
the first shot for AR2, the starting delay for this sequence is defined by
Discrimination time of Shot 2 for AR2.
For older firmware versions (< 5.1) starting at other shot than
shot 1 or skipping shots is not possible. AR request lines must
be enabled to consecutive shots starting from shot 1. If AR
sequence is not yet started, an AR request which is not enabled