ABB Relion 670 Series Applications Manual page 317

1MRK 511 358-UUS A
Signal
BC_12_CL
VP_BC_12
EXDU_BC
These signals from each bus-coupler bay (ABC_BC), except the own bay, are needed:
Signal
BC12CLTR
VPBC12TR
EXDU_BC
These signals from each bus-section disconnector bay (A1A2_DC) are also needed. For B1B2_DC,
corresponding signals from busbar B are used. The same type of module (A1A2_DC) is used for
different busbars, that is, for both bus-section disconnector A1A2_DC and B1B2_DC.
Signal
DCCLTR
VPDCTR
EXDU_DC
If the busbar is divided by bus-section circuit breakers, the signals from the bus-section coupler
bay (A1A2_BS), rather than the bus-section disconnector bay (A1A2_DC), must be used. For
B1B2_BS, corresponding signals from busbar B are used. The same type of module (A1A2_BS) is
used for different busbars, that is, for both bus-section circuit breakers A1A2_BS and B1B2_BS.
Signal
S1S2CLTR
VPS1S2TR
EXDU_BS
For a bus-coupler bay in section 1, these conditions are valid:
Application manual
Another bus-coupler connection exists between busbar WA1 and WA2.
The switch status of BC_12 is valid.
No transmission error from any bus-coupler bay (BC).
A bus-coupler connection through the own bus-coupler exists between busbar
WA1 and WA2.
The switch status of BC_12 is valid.
No transmission error from the bay that contains the above information.
The bus-section disconnector is closed.
The switch status of bus-section disconnector DC is valid.
No transmission error from the bay that contains the above information.
A bus-section coupler connection exists between bus sections 1 and 2.
The switch status of bus-section coupler BS is valid.
No transmission error from the bay containing the above information.
Section 13
Control
311