ABB REB670 Applications Manual page 146

Section 6
Differential protection
140
For station with just one CT in the bus-coupler bay, it might be required, depending on the
client requirements, to provide the special scheme for disconnection of bus-coupler CT
when the bus-coupler CB is open. For more info please refer to figure 45.
Some principle overall drawings of how to use REB670 in this type of station are given in
figure 62 to figure 66.
Disconnector aux. contact timing
(Aux. contact a timing is only crucial when Scheme2_INX is used)
Zone A
Main
contact
Zone B
Aux. a
contact
Aux. b
contact
189
b a
289
b a
BIM
Feeder Backup
152
CT Input
989
Other
TRM
Equipment
Feeder Bay
ANSI06000151 V1 EN
Figure 62: Feeder bay where a&b aux. contacts are used
Open Closed
Open Closed
Closed Open
SSxx
DISABLE
CLOSED
NO
OPEN
NC
ALARM
FORCED
SSxx
DISABLE
CLOSED
ZoneSel="CtrlIncludes"
NO
OPEN
NC
ALARM
FORCED
External or Internal
Bxxx
Feeder BFP Backup Trip
Command
BLKTR
CTRLZA
CTRLZB
OC Trip
TRZONE
TRBAY
A/D
I3PB1
BBP & BFP trip command to feeder breaker
1MRK 505 337-UUS -
REB 670
Set Parameter
TRIP
CONNZA
CONNZB
BOM
en06000151_ansi.vsd
Application manual