Siemens 7UT51

4 Transformer Differential Protection (87T and 87HS)
7UT51 v3
46 PRIM-2330C
Table 4.1 Vector Group Options and Zero Sequence Current Handling Options for a Delta Reference Winding
Group Lag Type Symbol Winding Wiring Elimination Correction Without
Delta
Reference Winding
0
0° Dd0
1
30° Dy1
2
60° Dd2
3
90° Dy3
4
120° Dd4
5
150° Dy5
6
180° Dd6
7
210° Dy7
8
240° Dd8
9
270° Dy9
10
300° Dd10
11
330° Dy11
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
c
a
b
a
b
c
ca
b
a
b
c
a
c
b
b
a
c
c
a
b
a
b
c
b
c
a
a
b
c
bc
a
a
b
c
c
b
a
a
b
c
b
ca
a
b
c