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6-11
Control Functions
Support for 2 Circuit Breakers
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
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
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.
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 and Skipping of AR Shots
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 for shot 1 will cause
final tripping. During sequence run an AR request which is not
enabled for the next shot will cause final tripping.
857-UM001A-EN-P – July 2009
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