Hitachi Relion 670 Series Applications Manual page 252

Section 12
Control
12.4.4.1 Application
The interlocking for transformer bay (AB_TRAFO) function is used for a transformer bay connected
to a double busbar arrangement according to figure 102. The function is used when there is no
disconnector between circuit breaker and transformer. Otherwise, the interlocking for line bay
(ABC_LINE) function can be used. This function can also be used in single busbar arrangements.
QB1
QA1
T
QA2
QB3
IEC04000515 V1 EN-US
Figure 102:
The signals from other bays connected to the module AB_TRAFO are described below.
12.4.4.2 Signals from bus-coupler
If the busbar is divided by bus-section disconnectors into bus-sections, the busbar-busbar connection
could exist via the bus-section disconnector and bus-coupler within the other bus-section.
(WA1)A1
(WA2)B1
(WA7)C
IEC04000487 V1 EN-US
Figure 103:
The project-specific logic for input signals concerning bus-coupler are the same as the specific logic
for the line bay (ABC_LINE):
246
WA1 (A)
WA2 (B)
QB2
QC1
AB_TRAFO
QC2
QC3
QA2 and QC4 are not
used in this interlocking
QC4
QB4
en04000515.vsd
Switchyard layout AB_TRAFO
Section 1
A1A2_DC(BS)
B1B2_DC(BS)
AB_TRAFO ABC_BC
Busbars divided by bus-section disconnectors (circuit breakers)
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Section 2
AB_TRAFO ABC_BC
en04000487.vsd
1MRK506375-UEN Rev. N
A2
B2
C
Railway application RER670
Application manual
M13567-3 v7
M13566-4 v4
M13566-6 v4