45
TRT33A Vector Groups IEC
Single-phase test of three-phase transformers IEC
Table of vector group connections (IEC)
No
.
Vector
group
Winding connections
Connections
Phase
Limb
Short
circuit
Tested winding
Calculated
ratio
HV winding
XV winding
HV winding
XV winding
1
1ø
1ph0
1ø
-
1.1-1.2
2.1-2.2
2
1
U
U
2
1ø
1ph6
1ø
-
1.1-1.2
2.2-2.1
2
1
U
U
3
Yy0
A
B
C
II+I
III+II
I+III
-
-
-
1V-1U
1W-1V
1U-1W
2V-2U
2W-2V
2U-2W
2
1
U
U
4
Yyn0
A
B
C
I+II
II+III
III+I
-
-
-
1U-1V
1V-1W
1W-1U
2U-2V
2V-2W
2W-2U
2
1
U
U
5
YNy0
A
B
C
I
II
III
1V-1N
1W-1N
1U-1N
1U-(1V+1N)
1V-(1W+1N)
1W-(1U+1N)
2U-2V
2V-2W
2W-2U
2
1
U
U
6
YNyn0
A
B
C
I
II
III
-
-
-
1U-1N
1V-1N
1W-1N
2U-2N
2V-2N
2W-2N
2
1
U
U
7
Yy6
A
B
C
II+I
II+III
I+III
-
-
-
1V-1U
1W-1V
1U-1W
2U-2V
2V-2W
2W-2U
2
1
U
U
8
Yyn6
A
B
C
I+II
II+III
III+I
-
-
-
1U-1V
1V-1W
1W-1U
2V-2U
2W-2V
2U-2W
2
1
U
U
9
YNy6
A
B
C
I
II
III
1V-1N
1W-1N
1U-1N
1U-1N
1V-1N
1W-1N
2V-2U
2W-2V
2U-2W
2
1
U
U
1.1
1.2
2.1
2.2
1.1
1.2
2.2
2.1
a
A
1V
1U
1W
2V
2U
2W
*
*
B
C
c
b
A
1V
1U
1W
2V
2U
2W
2N
*
B
C
a
c
b
a
1V
1U
1W
2V
2U
2W
*
1N
B
C
A
c
b
1V
1U
1W
2V
2U
2W
1N
2N
B
C
A
a
c
b
1V
1U
1W
2V
2U
2W
*
*
B
C
a
b
c
A
A
1V
1U
1W
2V
2U
2W
2N
*
B
C
a
b
c
1V
1U
1W
2V
2W
2U
*
1N
B
C
A
a
b
c