2.15 Automatic Reclosure Function (optional)
285
7SD5 Manual
C53000-G1176-C169-1
2.15.1 Functional Description
Reclosure is performed by an automatic reclosure function (AR). An example of the
normal time sequence of a double reclosure is shown in the following Figure.
Figure 2-120 Timing diagram of a double-shot reclosure with action time (2nd reclosure successful)
The integrated automatic reclosure circuit allows up to 8 reclosure attempts. The first
four interrupt cycles may operate with different parameters (action and dead times,
single/three-pole). The parameters of the fourth cycle also apply for the fifth cycle and
onwards.
Activation and De-
activation
The automatic reclosure function can be switched on and off by means of the param-
eter 3401 AUTO RECLOSE, or via the system interface (if available) and via binary
input (if this is allocated). The switched state is saved internally (refer to Figure 2-121)
and secured against loss of auxiliary supply. It is only possible to switch on from the
source where previously it had been switched off from. To be active, it is necessary
that the function of all three switching sources is switched on.
Alteration of the switching state via setting or the system interface is not possible
during a running fault.
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