Interlocking For Transformer Bay Ab_Trafo; Application - ABB Relion REC670 Applications Manual

1MRK 511 358-UEN A
• QC71_OP = 1
• QC71_CL = 0
If there is no second busbar B and therefore no QB2 and QB20 disconnectors, then the
interlocking for QB2 and QB20 are not used. The states for QB2, QB20, QC21, BC_12, BBTR are
set to open by setting the appropriate module inputs as follows. In the functional block
diagram, 0 and 1 are designated 0=FALSE and 1=TRUE:
• QB2_OP = 1
• QB2_CL = 0
• QB20_OP = 1
• QB20_CL = 0
• QC21_OP = 1
• QC21_CL = 0
• BC_12_CL = 0
• VP_BC_12 = 1
• BBTR_OP = 1
• VP_BBTR = 1
13.4.4

Interlocking for transformer bay AB_TRAFO

13.4.4.1

Application

The interlocking for transformer bay (AB_TRAFO) function is used for a transformer bay
connected to a double busbar arrangement according to figure 121. 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.
Application manual
Section 13
Control
IP14149-1 v2
M13567-3 v7
277