ABB REB670 Series Applications Manual page 125

1MRK 505 370-UEN D
QA1
BI1
2000/1
QA2
BI2
2000/1
BI3
2000/1
QA3
1½ breaker
Diameter
IEC06000149 V1 EN-US
Figure 60: Diameter in one-and-half breaker station with breaker failure protection for
6.1.4.8 Double busbar single breaker arrangement
This type of arrangement is shown in Figure 61.
BI1
QA1
IEC11000239 V1 EN-US
Figure 61: Example of double busbar station
This type of busbar arrangement is very common. It is often preferred for larger installations.
It provides good balance between maintenance work requirements and security of supply. If
needed, two busbars can be split during normal service. The requirement for busbar
protection scheme is that the scheme must have two independent differential zones, one for
each busbar. In case of an internal fault on one of the two buses, bus-coupler circuit breaker
and all feeder circuit breakers associated with the faulty bus have to be tripped, leaving other
Busbar protection REB670
Application manual
REB 670
Zone A
QA1 Internal BFP
Backup Trip Command
TRM
CT Input
A/D
Other
Equipment
CT Input
A/D
Other
Equipment
QA2 Internal BFP
Backup Trip Command
CT Input
A/D
Other
Equipment
QA3 Internal BFP
Backup Trip Command
Zone B
all three breakers inside REB670
QB1 QB2 QB1 QB2 QB1 QB2
QA1 QA1 QA1
BI1 BI1 BI1
OR
Bxxx
BLKTR
CTRLZA
CTRLZB
TRZONE
TRBAY
Parameter ZoneSel must
I3PB1
Bxxx
BLKTR
ZERO-
CTRLZA
ZERO- CTRLZB
TRZONE
Parameter ZoneSel must
OR
TRBAY
be set to "CtrlIncludes"
I3PB1
and CTConnection="Off"
Bxxx
BLKTR
CTRLZA
CTRLZB
TRZONE
Parameter ZoneSel must
TRBAY
I3PB1
OR
QB1 QB2 QB1 QB2 QB1 QB2
QA1 QA1 QA1
BI1 BI1 BI1
Differential protection
BFP
Remote
End
Inter-
Trip
Feeder 1
TRIP
CONNZA
BBP &
CONNZB
BFP
TRIP
QA1
be set to "FixedToZA"
BFP
TRIP
TRIP
QA2
CONNZA
CONNZB
BBP &
BFP
TRIP
TRIP
CONNZA
QA3
CONNZB
be set to "FixedToZB"
BFP
Remote
End
Inter-
BOM
Trip
Feeder 2
en06000149.vsd
ZA
ZB
IEC11000239-1-en.vsd
Section 6
M6647-3 v5
119