ABB Relion 670 Series Technical Reference Manual page 753

1MRK505222-UUS C
12.4.11
12.4.11.1
Technical reference manual
Name Type
VPQB2TR BOOLEAN
VPQB7TR BOOLEAN
VPQB12TR BOOLEAN
Interlocking for transformer bay AB_TRAFO (3)
Introduction
The interlocking for transformer bay (AB_TRAFO, 3) function is used for a
transformer bay connected to a double busbar arrangement according to figure 375.
The function is used when there is no disconnector between circuit breaker and
transformer. Otherwise, the interlocking for line bay (ABC_LINE, 3) function can be
used. This function can also be used in single busbar arrangements.
189
289
189G
152
289G
389G
252
489G
389 489
ANSI04000515 V1 EN
Figure 375: Switchyard layout AB_TRAFO (3)
Description
Switch status of 289 is valid (open or closed)
Switch status of 789 is valid (open or closed)
Switch status of 189 and 289 are valid (open or closed)
WA1 (A)
WA2 (B)
AB_TRAFO
252 and 489G are not
used in this interlocking
en04000515_ansi.vsd
Section 12
Control
747