Sequence - ABB RELION REX640 Technical Manual

1MRS759142 C
9.9.6.2
REX640
Technical Manual
• 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 command
• 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.
GUID-A2B66651-6BCE-4725-8FA1-B1803685EAEF V1 EN
Figure 803: 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.

Sequence

The auto reclose sequence is implemented by using CBBs. The highest possible
amount of CBBs is seven. If the user wants to have, for example, a sequence of three
shots, only the first three CBBs are needed. Using building blocks instead of fixed
shots gives enhanced flexibility, allowing multiple and adaptive sequences.
Section 9
Control functions
1525