Siemens 7UT51 Instruction Manual page 82

6
Bus Differential Protection (87B)
A
A
Figure 6.1 Typical CT Wiring for a Bus with Two Branches
Figure 6.2 Typical CT Wiring for a Bus with Three Branches
82
Branch 1
B C
B C
Branch 2
Branch 1
A B C
A B C
Branch 2
I
3A1
A
I
2A1
B
I
1A1
C
I
3B1
a
I
2B1
b
I
1B1
c
7UT51 Relay
I
3A1
A
I
2A1
B
I
1A1
C
Branch 3
I
A
3D1
a'
I
B
b' 2C1
I
C
1C1
c'
I
3B1
a
I
2B1
b
I
1B1
c
7UT513
3A2
2A2
1A2
3B2
2B2
1B2
3A2
2A2
1A2
3D2
2C2
1C2
3B2
2B2
1B2
PRIM-2330C
7UT51 v3