Hitachi Relion 670 Series Applications Manual page 254

Section 12
Control
12.4.5.2 Signals from all feeders
If the busbar is divided by bus-section circuit breakers into bus-sections and both circuit breakers are
closed, the opening of the circuit breaker must be blocked if a bus-coupler connection exists between
busbars on one bus-section side and if on the other bus-section side a busbar transfer is in progress:
(WA1)A1
(WA2)B1
(WA7)C
IEC04000489 V1 EN-US
Figure 105:
To derive the signals:
Signal
BBTR_OP
VP_BBTR
EXDU_12
These signals from each line bay (ABC_LINE), each transformer bay (AB_TRAFO), and bus-coupler
bay (ABC_BC) are needed:
Signal
QB12OPTR
VPQB12TR
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:
248
Section 1
ABC_BC
ABC_LINE AB_TRAFO
Busbars divided by bus-section circuit breakers
No busbar transfer is in progress concerning this bus-section.
The switch status of BBTR is valid.
No transmission error from any bay connected to busbar 1(A) and 2(B).
QB1 or QB2 or both are open.
The switch status of QB1 and QB2 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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Section 2
A1A2_BS
ABC_BC
B1B2_BS
ABC_LINE
1MRK506375-UEN Rev. N
A2
B2
C
AB_TRAFO
en04000489.vsd
Railway application RER670
Application manual
M15111-6 v4