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Technical description
5 Control functions
5.8 Auto-reclose function (79)
VM59.EN001
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If the reclaim time runs out, the auto-reclose sequence is
successfully executed and the AR function moves to ready -
state and waits for a new AR request in shot 1.
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, the 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.
Manual opening
Manual CB open command during AR sequence will stop the
sequence and leave the CB open.
Reclaim time setting
Use shot specific reclaim time: No
Reclaim time setting defines reclaim time between different
shots during sequence and also reclaim time after manual
closing.
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.
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
Содержание VAMP 59
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