ABB Relion 650 Series Applications Manual page 154

Section 10
Control
These signals from each line bay (ABC_LINE), each transformer bay (AB_TRAFO), and bus-coupler
bay (ABC_BC) are needed:
Signal
1289OPTR
VP1289TR
EXDU_12
These signals from each bus-coupler bay (ABC_BC) are needed:
Signal
BC12OPTR
VPBC12TR
EXDU_BC
These signals from the bus-section circuit breaker bay (A1A2_BS, B1B2_BS) are needed.
Signal
S1S2OPTR
VPS1S2TR
EXDU_BS
For a bus-section circuit breaker between A1 and A2 section busbars, these conditions are valid:
148
189 or 289 or both are open.
The switch status of 189 and 289 are valid.
No transmission error from the bay that contains the above information.
No bus-coupler connection through the own bus-coupler between busbar WA1
and WA2.
The switch status of BC_12 is valid.
No transmission error from the bay that contains the above information.
No bus-section coupler connection between bus-sections 1 and 2.
The switch status of bus-section coupler BS is valid.
No transmission error from the bay that contains the above information.
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1MRK 505 287-UUS B
Busbar protection REB650
Application manual