en06000137_ansi.vsd
Zone A
Zone B
ZI
ACTIVE
BOM
BIM
REB 670
Bus coupler
EXTSTART
ALARM
Indication that
Zone interconnection
is active
B
C
C
B
clo
sin
g
sw
itch
189
289
152
52b
AND NOT
0-tOFF
ANSI06000137 V1 EN-US
Figure 50: Configuration logic for bus coupler without main CTs
6.1.3.7 End fault protection
SEMOD127750-31 v4
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
51.
1MRK 505 370-UUS A Section 6
Differential protection
Busbar protection REB670 2.2 ANSI 127
Application manual
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