Siemens 7UT51

5
Motor or Generator Differential Protection (87M/G)
7UT51 v3
70 PRIM-2330C
Figure 5.1
Typical CT Wiring for a Longitudinal
-
Winding Motor/Generator
Figure 5.2
Typical CT Wiring for a Transverse
-
Winding Motor or Generator
Secondary
Primar
y
ABC
7UT51 Relay
I
A
I
B
I
C
I
A
I
B
I
C
3A1
3A2
2A1
2A2
1A1
1A2
3B1
3B2
2B1 2B2
1B1
1B2
Primary
Secondary
A
B
C
7UT51 Relay
3A1
2A1
1A1
3A2
2A2
1A2
3B2
2B2
1B2
3B1
2B1
1B1