ABB REO 517, Applications Manual

Page: 267 / 440

257
Interlocking
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The project-specific logic for input signals concerning bus coupler are the same as the
specific logic for the line bay (ABC_LINE):
The logic is identical to the double busbar configuration described in "Signals from bus
coupler".
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If there is no second busbar B and therefore no Q2 disconnector, then the interlocking
for Q2 is not used. The state for Q2, Q25, BC_AB are set to open by setting the appro-
priate module inputs as follows. In the functional block diagram, 0 and 1 are designated
0=FIXD-OFF and 1=FIXD-ON:
• Q2_OP = 1
• Q2_CL = 0
• Q25_OP = 1
• Q25_CL = 0
• BC_AB_CL = 0
If there is no second busbar B at the other side of the transformer and therefore no TQ2
disconnector, then the state for TQ2 is set to open by setting the appropriate module in-
puts as follows:
• TQ2_OP = 1
• TQ2_CL = 0
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The interlocking module A1A2_BS is used for one bus-section circuit breaker between
section A1 and A2 according to figure 133. The module can be used for different bus-
bars, which includes a bus-section circuit breaker, that is, not only busbar A.
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BC_AB_CL Signal if a bus-coupler connection exists between busbar A and B.
VP_BC_AB The switch status of BC_AB is valid.
EXDUP_BC Signal if there is no transmission error from bay BC (bus-coupler bay).