Siemens 7UT51 Instruction Manual page 47

7UT51 v3
Group Lag Type
Wye
Reference Winding
0
0° Yy0
1
30° Yd1
2
60° Yy2
3
90° Yd3
4
120° Yy4
5
150° Yd5
6
180° Yy6
7
210° Yd7
8
240° Yy8
9
270° Yd9
10
300° Yy10
11
330° Yd11
Table 4.2 Vector Group Options and Zero Sequence Current Handling Options for a Wye Reference Winding
PRIM-2330C
Transformer Differential Protection (87T and 87HS)
Symbol Winding Wiring
C
A
A B
C
B
c
a
b
c
b a
c
b
a
b c
a
b
c
a
b
a c
b
a
c
a b
c
a
b
c
a
c
b
a
c
b
c a
b
Elimination
a
b
c
a
b
c
a
b
c
a
b
c
a
b
c
a
b
c
a
b
c
a
b
c
a
b
c
a
b
c
a
b
c
a
b
c
Correction Without
4
47