en06000149.vsd
REB 670
OR
BFP
Remote
End
Inter-
Trip
Feeder 1
CTRLZA
CTRLZB
TRIP
CONNZA
CONNZB
Bxxx
I3PB1
BLKTR
TRZONE
TRBAY
Zone A
BBP &
BFP
TRIP
QA1
BFP
TRIP
QA2
BBP &
BFP
TRIP
QA3
BFP
Remote
End
Inter-
Trip
Feeder 2
1½ breaker
Diameter
CTRLZA
CTRLZB
TRIP
CONNZA
CONNZB
Bxxx
I3PB1
BLKTR
TRZONE
TRBAY
BOM
Parameter ZoneSel must
be set to "FixedToZB"
Parameter ZoneSel must
be set to "FixedToZA"
CT Input
TRM
QA1 Internal BFP
Backup Trip Command
BI1
2000/1
QA1
BI2
2000/1
QA2
QA3
BI3
2000/1
Zone B
Other
Equipment
Other
Equipment
Other
Equipment
CT Input
CT Input
CTRLZA
CTRLZB
TRIP
CONNZA
CONNZB
Bxxx
I3PB1
BLKTR
TRZONE
TRBAY
A/D
A/D
A/D
Parameter ZoneSel must
be set to "CtrlIncludes"
and CTConnection="Off"
ZERO-
ZERO-
QA2 Internal BFP
Backup Trip Command
OR
OR
F
ee
de
r
1
F
ee
de
r
2
QA3 Internal BFP
Backup Trip Command
IEC06000149 V1 EN-US
Figure 60: Diameter in one-and-half breaker station with breaker failure protection for
all three breakers inside REB670
6.1.4.8
Double busbar single breaker arrangement
M6647-3 v5
This type of arrangement is shown in Figure
.
BI1
QA1
QB1 QB2
BI1
QA1
QB1 QB2
BI1
QA1
QB1 QB2
BI1
QA1
QB1 QB2
BI1
QA1
QB1 QB2
BI1
QA1
BI1
QB1 QB2
QA1
ZA
ZB
IEC11000239-1-en.vsd
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
1MRK 505 370-UEN D
Section 6
Differential protection
Busbar protection REB670
119
Application manual
Summary of Contents for REB670 Series
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