ABB RELION 670 Series Applications Manual page 134

Section 6
Differential protection
189
289
BI1
Bus-Coupler
Bay
ANSI06000154 V1 EN-US
Figure 65: Bus coupler bay with one CT and a&b aux. contact from CB
128
Zone A
Zone B
REB 670
CB Closing
Signal
b a
152
SSxx
DISABLE
NO
NC
BIM
External or Internal
Bus-Coupler BFP
Backup Trip Command
Bus-Coupler Backup
OC Trip
CT Input
A/D
Other
Equipment
t=1s
t
OR
CLOSED
OPEN
Bxxx
ALARM
BLKTR
TRIP
FORCED
CTRLZA
CONNZA
CTRLZB
CONNZB
ZEROCUR
TRZONE
TRBAY
I3PB1
TRM
Parameter ZoneSel must be
set to "FixedToZA&-ZB"
tZeroCurrent=150ms
BBP & BFP trip command to Bus-Coupler breaker
en06000154_ansi.vsd
1MRK 505 337-UUS A
BOM
Application manual