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Table 2. Matching of the power transformer
vector group, when the HV side of the power
transformer is delta connected.
Switchgroup SG1
1
2
3
4
5
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
1
1
0
0
0
0
0
1
0
0
1
0
1
0
0
0
1
1
0
0
1
1
1
0
0
0
0
0
1
0
1
0
0
1
0
0
1
0
1
0
1
1
0
1
0
0
0
1
1
0
1
0
1
1
0
0
1
1
1
0
1
1
1
1
0
0
0
0
0
1
1
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
0
1
0
1
1
0
1
0
1
0
1
1
0
1
1
1
1
0
1
0
0
0
1
1
1
0
0
1
1
0
1
0
1
1
1
1
0
1
1
0
0
1
1
1
1
0
1
1
1
0
1
1
1
1
1
1
1
1
1
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
1
1
0
0
0
1) When comparing the checksum displayed by the relay with the checksum of switches 1...6
the weighting factors of switch 7 and 8 must be added to the latter checksum.
2) I refers to the basic coupling I of the current transformers, i.e. inside OR outside earthings,
c.f. application example 4 of the description "Biased differential relay SPAD 330 C,
34 SPAD 4 EN 1"
3) II refers to the basic coupling II of the current transformers, i.e. inside AND outside earthings,
c.f. application example 5 of the description "Biased differential relay SPAD 330 C,
34 SPAD 4 EN 1"
Power transformer
vector group
Check-
6
I
(2
sum (
1
0
0
Dd6
0
1
Dy7
0
2
Dy11
0
3
Dd0
0
4
Dy1
0
5
Dy5
0
6
Dyn5
0
7
Dd6
0
8
Dd10
0
9
Dyn11
0
10
Dd0
0
11
Dd4
0
12
Dyn1
0
13
Dd2
0
14
Dd6
0
15
Dyn7
0
16
Dd8
0
17
Dd0
0
18
Dd0
0
19
Dy1
0
20
Dy5
0
21
Dd6
0
22
Dy7
0
23
Dy11
0
24
Dyn11
0
25
Dd0
0
26
Dd4
0
27
Dyn5
0
28
Dd6
0
29
Dd10
0
30
Dyn7
0
31
Dd8
1
32
Dd0
1
33
Dyn1
1
34
Dd2
1
35
Dd6
Relay connection
group
HV side
II
(3
Dd0
Yy0
Dy1
Yd1
Dy5
Yd5
Dd6
Yy6
Dy7
Yd7
Dy11
Yd11
Dyn11
Yy0
Dd0
Yd1
Dd4
Yd5
Dyn5
Yy6
Dd6
Yd7
Dd10
Yd11
Dyn7
Yy0
Dd8
Yd1
Dd0
Yd5
Dyn1
Yy6
Dd2
Yd7
Dd6
Yd11
Dd6
Yy0
Dy7
Yd1
Dy11
Yd5
Dd0
Yy6
Dy1
Yd7
Dy5
Yd11
Dyn5
Yy0
Dd6
Yd1
Dd10
Yd5
Dyn11
Yy6
Dd0
Yd7
Dd4
Yd11
Dyn1
Yy0
Dd2
Yd1
Dd6
Yd5
Dyn7
Yy6
Dd8
Yd7
Dd0
Yd11
B
LV side
Yy0
Yy0
Yy0
Yy0
Yy0
Yy0
Yd1
Yd1
Yd1
Yd1
Yd1
Yd1
Yd5
Yd5
Yd5
Yd5
Yd5
Yd5
Yy6
Yy6
Yy6
Yy6
Yy6
Yy6
Yd7
Yd7
Yd7
Yd7
Yd7
Yd7
Yd11
Yd11
Yd11
Yd11
Yd11
Yd11
7
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