ABB Relion 670 Series Technical Reference Manual page 631

1MRK505222-UUS C
LINE1_OP
LINE1_CL
BUS1_OP
BUS1_CL
LINE2_OP
LINE2_CL
BUS2_OP
BUS2_CL
VB1OK
VB1FF
VB2OK
VB2FF
VL1OK
VL1FF
VL2OK
VL2FF
BLOCK
ANSI05000781 V1 EN
Figure 313: Simplified logic diagram for the voltage selection function for the tie circuit breaker in breaker-and-a-
half arrangement.
Technical reference manual
AND
AND
AND
AND
AND
AND
OR
OR
OR
OR
Fuse failure supervision
External fuse failure signals or signals from a tripped fuse switch/MCB are connected
to binary inputs that are configured to the inputs of SESRSYN (25) function in the
IED. Alternatively, the internal signals from fuse failure supervision can be used when
available. There are two alternative connection possibilities. Inputs labelled OK must
be connected if the available contact indicates that the voltage circuit is healthy. Inputs
NOT
AND
line1Voltage
bus1Voltage
NOT
AND
line2Voltage
bus2Voltage
AND
OR
AND
AND
AND
Section 12
Control
L1SEL
B1SEL
busVoltage
L2SEL
B2SEL
invalidSelection
OR
lineVoltage
AND
selectedFuseOK
VSELFAIL
AND
en05000781_ansi.vsd
625