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240
Interlocking
•
Disconnectors cannot break power current or connect different voltage systems.
Disconnectors in series with a circuit breaker can only be operated if the circuit
breaker is open, or if the disconnectors operate in parallel to other closed connec-
tion. Other disconnectors can be operated if one side is completely isolated, or if the
disconnectors operate in parallel to other closed connection, or if they are earthed
on both sides.
•
Circuit breaker closing is only interlocked against running disconnectors in its bay
or additionally in a transformer bay against the disconnectors and earthing switch
on the other side of the transformer, if there is no disconnector between CB and
transformer.
•
Circuit breaker opening is only interlocked at a bus-coupler bay, if a bus bar transfer
is in progress.
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The implementation of the interlocking is decentralised to each bay. There are different
interlocking modules dependent on the topology kind of the substation (breaker and a
half or various bus bar arrangements) and the bay types. The interlocking logic for each
module is specified in boolean algebra for the switch states. To keep their amount easy
to handle, only operating sequences in normal service are permitted. For other uncom-
mon operations, the command handling has an interlock override feature.
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To make the implementation of the interlocking function easy, several standard mod-
ules are available:
•
Line for double and transfer busbars, ABC_LINE
•
Bus coupler for double and transfer busbars, ABC_BC
•
Transformer bay for double busbars, AB_TRAFO
•
Bus-section breaker for double busbars, A1A2_BS
•
Bus-section disconnector for double busbars, A1A2_DC
•
Busbar earthing switch, BB_ES
•
Double CB bay, DB_BUS_A, DB_LINE, DB_BUS_B
•
1 1/2-CB diameter, BH_LINE_A, BH_CONN, BH_LINE_B
These standard modules are available:
•
2 pcs A1A2_DC and
•
6 pcs BB_ES and
•
DB_BUS_A, DB_LINE, DB_BUS_B and
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