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Figure 107: Simplified CBB diagram
Each CBB has individual Init signals CBB_ and Blk signals CBB_ settings. Therefore,
each initiation line can be used for both initiating and blocking any or all auto-reclose
shots.
Other conditions that must be fulfilled before any CBB can be initiated are, for
example, the closed position of the circuit breaker.
10.4.3.2 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.
Each CBB is identical. The Shot number CBB_ setting defines at which point in the
auto-reclose sequence the CBB should be performed, that is, whether the particular
CBB is going to be the first, second, third, fourth or fifth shot.
During the initiation of a CBB, the conditions of initiation and blocking are checked.
This is done for all CBBs simultaneously. Each CBB that fulfils the initiation
conditions requests an execution.
The function also keeps track of shots already performed, that is, at which point the
auto-reclose sequence is from shot 1 to lockout. For example, if shots 1 and 2 have
already been performed, only shots 3 to 5 are allowed.
Additionally, the Enable shot jump setting gives two possibilities:
1MRS756378 D Section 10
Control functions
REF615 217
Application Manual