48
TRT33A Vector Groups 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
26 YNzn5
A
B
C
II+I
III+II
I+III
-
-
-
1V-1U
1W-1V
1U-1W
2U-2N
2V-2N
2W-2N
2
1
3
U
U
27
Yz7
A
B
C
I+II+III
II+I+III
III+I+II
1V-1W
1W-1U
1U-1V
1U-(1V+1W)
1V-(1W+1U)
1W-(1U+1V)
2V-2U
2W-2V
2U-2W
2
3
2
1
U
U
28
Yzn7
A
B
C
II+I
III+II
I+III
-
-
-
1V-1U
1W-1V
1U-1W
2N-2V
2N-2W
2N-2U
2
1
3
U
U
29
YNz7
A
B
C
I+II+III
II+I+III
III+I+II
1V-1W
1W-1U
1U-1V
1U-(1V+1W)
1V-(1W+1U)
1W-(1U+1V)
2V-2U
2W-2V
2U-2W
2
3
2
1
U
U
30 YNzn7
A
B
C
II+I
III+II
I+III
-
-
-
1V-1U
1W-1V
1U-1W
2N-2V
2N-2W
2N-2U
2
1
3
U
U
31
Yz11
A
B
C
I+II+II
I
II+I+II
I
III+I+I
I
1W-1V
1U-1W
1V-1U
1U-(1W+1V)
1V-(1U+1W)
1W-(1V+1U)
2U-2W
2V-2U
2W-2V
2
3
2
1
U
U
32
Yzn11
A
B
C
II+I
III+II
I+III
-
-
-
1V-1U
1W-1V
1U-1W
2N-2U
2N-2V
2N-2W
2
1
3
U
U
33 YNz11
A
B
C
I+II+III
II+I+III
III+I+II
1W-1V
1U-1W
1V-1U
1U-(1W+1V)
1V-(1U+1W)
1W-(1V+1U)
2U-2W
2V-2U
2W-2V
2
3
2
1
U
U
1V
1U
1W
1N
A
B
C
2V
2U
2W
2N
a
b
c
1V
1U
1W
*
B
C
b
2U
2V
*
2W
a
c
A
b
A
1V
1U
1W
*
2U
2W
2N
2V
B
C
a
c
1V
1U
1W
1N
B
C
b
2U
2V
*
2W
a
c
A
b
1V
1U
1W
1N
2U
2W
2N
2V
A
B
C
a
c
1V
1U
1W
*
2U
B
C
2W
2V
*
a
b
c
A
1V
1U
1W
*
2W
2V
2N
2U
B
C
a
b
c
A
1N
1V
1U
1W
2U
B
C
2W
2V
*
a
b
c
A