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Section 6
Differential protection
QB1
QB2
QA1
2400/1
Bus-Coupler
Bay
IEC06000154 V1 EN-US
Figure 65: Bus coupler bay with one CT and a&b aux. contact from CB
QB1
QB2
QA1
BI1
2400/1
Bus-Coupler
Bay
IEC06000155 V1 EN-US
Figure 66: Bus coupler bay with one CT and b aux. contact only from CB
124
Zone A
Zone B
REB 670
CB Closing
Signal
b a
SSxx
DISABLE
NO
NC
BI1
BIM
External or Internal
Bus-Coupler BFP
Backup Trip Command
Bus-Coupler Backup
CT Input
Other
Equipment
Zone A
Zone B
REB 670
b
BIM
CB Closing
Signal
External or Internal
Bus-Coupler BFP
Backup Trip Command
Bus-Coupler Backup
OC Trip
CT Input
Other
Equipment
t=1s
t
³1
CLOSED
OPEN
Bxxx
ALARM
BLKTR
FORCED
CTRLZA
CTRLZB
ZEROCUR
TRZONE
TRBAY
I3PB1
OC Trip
TRM
Parameter ZoneSel must be
set to "FixedToZA&-ZB"
tZeroCurrent=150ms
A/D
BBP & BFP trip command to Bus-Coupler breaker
t=1s
t
³1
&
Bxxx
BLKTR
CTRLZA
CONNZA
CTRLZB
CONNZB
ZEROCUR
TRZONE
TRBAY
I3PB1
TRM
Parameter ZoneSel must
be set to "FixedToZA&-ZB"
tZeroCurrent=150ms
A/D
BBP & BFP trip command to Bus-Coupler breaker
TRIP
CONNZA
CONNZB
BOM
en06000154.vsd
TRIP
BOM
en06000155.vsd
Busbar protection REB670
1MRK 505 370-UEN D
Application manual
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