Siemens 7UT51

7UT51 v3
Transformer Differential Protection (87T and 87HS) 4
PRIM-2330C 47
Table 4.2 Vector Group Options and Zero Sequence Current Handling Options for a Wye Reference Winding
Group Lag Type Symbol Winding Wiring Elimination Correction Without
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
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
bc
a
b
c
c
a
b
a
b
c
c
a
b
b
a
c
a
c
b
a
b
c
c
a
b
a
b
c
b
c
a
a
b
c
b
c
a
a
b
c
c
b
a
a
b
c
b
ca
a
b
c