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Vector group
Table 1. Matching of the power transformer
matching
vector group, when the HV side of the power
transformer is star connected.
1) When comparing the checksum displayed by the relay with the checksum of switches 1...6
2) I refers to the basic coupling I of the current transformers, i.e. inside OR outside earthings,
3) Il refers to the basic coupling II of the current transformers, i.e. inside AND outside earthings,
6
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
the weighting factors of switch 7 and 8 must be added to the latter checksum.
c.f. application examples 1 and 3 of the description "Biased differential relay SPAD 330 C,
34 SPAD 4 EN 1"
c.f. application example 2 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
Yy6
0
1
YNd7
0
2
YNd11
0
3
Yy0
0
4
YNd1
0
5
YNd5
0
6
Yd5
0
7
YNyn6
0
8
YNyn10
0
9
Yd11
0
10
YNyn0
0
11
YNyn4
0
12
Yd1
0
13
YNyn2
0
14
YNyn6
0
15
Yd7
0
16
YNyn8
0
17
YNyn0
0
18
Yy0
0
19
YNd1
0
20
YNd5
0
21
Yy6
0
22
YNd7
0
23
YNd11
0
24
Yd11
0
25
YNyn0
0
26
YNyn4
0
27
Yd5
0
28
YNyn6
0
29
YNyn10
0
30
Yd7
0
31
YNyn8
1
32
YNyn0
1
33
Yd1
1
34
YNyn2
1
35
YNyn6
Relay connection
group
HV side
II
(3
Yy0
Yy0
YNd1
Yd1
YNd5
Yd5
Yy6
Yy6
YNd7
Yd7
YNd11
Yd11
Yd11
Yy0
YNyn0
Yd1
YNyn4
Yd5
Yd5
Yy6
YNyn6
Yd7
YNyn10
Yd11
Yd7
Yy0
YNyn8
Yd1
YNyn0
Yd5
Yd1
Yy6
YNyn2
Yd7
YNyn6
Yd11
Yy6
Yy0
YNd7
Yd1
YNd11
Yd5
Yy0
Yy6
YNd1
Yd7
YNd5
Yd11
Yd5
Yy0
YNyn6
Yd1
YNyn10
Yd5
Yd11
Yy6
YNyn0
Yd7
YNyn4
Yd11
Yd1
Yy0
YNyn2
Yd1
YNyn6
Yd5
Yd7
Yy6
YNyn8
Yd7
YNyn0
Yd11
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
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