North Bus Zone - GE B90 Instruction Manual

10 APPLICATION OF SETTINGS
10.2ZONING AND DYNAMIC BUS REPLICA
With reference to the following diagram, the North bus differential zone is bounded by the following CTs: CT-1, CT-2 (if S-1
closed), CT-3 (if S-3 closed), CT-4 (if S-5 closed), CT-5 and CT-8. The North bus protection should operate the following
breakers: B-1, B-2 (if S-1 closed), B-3 (if S-3 closed), B-4 (if S-5 closed), B-5 and B-7.
B-1
CT-1
CT-2 B-2
C-1 C-2
The South bus differential zone is bounded by the following CTs: CT-2 (if S-2 closed), CT-3 (if S-4 closed), CT-4 (if S-6
closed), CT-6 and CT-7. The South bus protection should operate the following breakers: B-2 (if S-2 closed), B-3 (if S-4
closed), B-4 (if S-6 closed), B-6 and B-7.
B-1
CT-1
CT-2 B-2
C-1 C-2
GE Multilin
C-3
S-1
S-3
CT-4
CT-3 B-3
S-2
S-4
C-4
Figure 10–3: NORTH BUS ZONE
C-3
S-1
S-3
CT-4
CT-3 B-3
S-2
S-4
Figure 10–4: SOUTH BUS ZONE
B90 Low Impedance Bus Differential System
10.2 ZONING AND DYNAMIC BUS REPLICA
C-5
S-5
B-4
S-6
C-5
S-5
B-4
S-6
C-4

10.2.1 NORTH BUS ZONE

NORTH BUS
B-5
CT-7
CT-5
B-7
CT-6
CT-8
B-6
SOUTH BUS
836733A1.CDR
10.2.2 SOUTH BUS ZONE
NORTH BUS
B-5
CT-7
CT-5
B-7
CT-6
CT-8
B-6
SOUTH BUS
836734A1.CDR
10-3
10