Siemens 7UT51 Instruction Manual page 46

4
Transformer Differential Protection (87T and 87HS)
Group Lag Type
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
Vector Group Options and Zero Sequence Current Handling Options for a Delta Reference Winding
Table 4.1
46
Symbol Winding Wiring
C
A
B
A
C
B
c
a
b
c
b a
c
b
a
c
b
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
7UT51 v3
Correction Without
PRIM-2330C