End Fault Protection - ABB REB670 Applications Manual

1MRK 505 337-UUS -
6.1.3.10
Application manual
Zone A
Zone B
289
189
52b
152
Bus coupler
ANSI06000137 V1 EN
Figure 47: Configuration logic for bus coupler without main CTs

End fault protection

When Live tank CBs or GIS are involved, there is a physical separation between the CT
and the CB. End Fault Protection is related to primary faults between main CT and CB in
a feeder bay. Therefore, it is directly related to the position of the main CT in feeder bay.
Three CT positions in feeder bays are typically used in power systems around the world,
as shown in figure 48.
REB 670
BIM
0-tOFF AND
Section 6
Differential protection
ZI
NOT
EXTSTART ACTIVE
ALARM
Indication that
Zone interconnection
is active
en06000137_ansi.vsd
BOM
117