ABB RELION 620 Series Technical Manual page 742

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Control functions

Not allowed: no automatic initiation is allowed

When the synchronization fails, the automatic initiation is carried out when the auto

wait time elapses and the reclosing is prevented due to a failure during the

synchronism check

When the circuit breaker does not close, the automatic initiation is carried out if the

circuit breaker does not close within the wait close time after issuing the reclose

Both: the automatic initiation is allowed when synchronization fails or the circuit

breaker does not close.

The Auto init parameter defines which INIT_X lines are activated in the

auto-initiation. The default value for this parameter is "0", which means

that no auto-initiation is selected.

A070871-ANSI V1 EN

Example of an auto-initiation sequence with synchronization failure in the

first shot and circuit breaker closing failure in the second shot

In the first shot, the synchronization condition is not fulfilled (SYNC is FALSE). When the

auto wait timer elapses, the sequence continues to the second shot. During the second

reclosing, the synchronization condition is fulfilled and the close command is given to the

circuit breaker after the second reclose time has elapsed.

After the second shot, the circuit breaker fails to close when the wait close time has

elapsed. The third shot is started and a new close command is given after the third reclose

time has elapsed. The circuit breaker closes normally and the reclaim time starts. When the

reclaim time has elapsed, the sequence is concluded successful.

The autoreclose sequence is implemented by using up to seven CBBs. For example, if the

user wants a sequence of three shots then only the first three CBBs are needed. Using

1MAC504801-IB E

620 series ANSI

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