ABB REB670 Applications Manual page 121

1MRK 505 337-UUS -
Application manual
as soon as the bus-section or bus-coupler circuit breaker is opened. This arrangement can
be easily achieved within the IED. In such application the bus section or bus coupler
current transformer shall be wired just to one current input of the IED. Then in the
Parameter Setting tool for the corresponding bay parameter ZoneSel shall be set to
FIXEDtoZA&-ZB. This will insure that this current is given to both differential zones. In
order to disconnect this current from both zones, when the coupler/section breaker is open
additional logic as shown in figure
two binary inputs are at least necessary in order to guaranty proper operation of such logic:
• Normally closed contact of the bus section or bus coupler circuit breaker
• Signal from the bus section or bus coupler circuit breaker closing circuit that
somebody wants to close the breaker
This solution does not depend on contact timing between the main contacts and auxiliary
contact of the circuit breaker. It directly follows the philosophy used for RADSS/REB 103
schemes used for similar applications before. Principle connection between the bus-
coupler CB normally closed auxiliary contact (b-contact), REB670 and internal
configuration logic, as shown in figure
Zone A
Zone B
REB 670
189
289
b
152
BI1
BIM
CB Closing
Signal
Bus-Coupler
Bay
CT Input
Other
Equipment
ANSI06000155 V1 EN
Figure 45: Bus coupler bay with one CT and b aux. contact only from CB
45 have to be done in the configuration. The following
45
t=1s
t
OR
AND
Bxxx
BLKTR
CTRLZA
CTRLZB
External or Internal
ZEROCUR
Bus-Coupler BFP
TRZONE
Backup Trip Command
TRBAY
I3PB1
Bus-Coupler Backup
OC Trip
TRM
Parameter ZoneSel must
be set to "FixedToZA&-ZB"
tZeroCurrent=150ms
A/D
BBP & BFP trip command to Bus-Coupler breaker
Section 6
Differential protection
TRIP
CONNZA
CONNZB
BOM
en06000155_ansi.vsd
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