55
TRT33A Vector Groups IEC
Table of vector group connections -autotransformers (IEC)
No.
Vector
group
Winding connections
Connections
Phase
Limb
Short
circuit
Tested winding
Calculated
ratio
HV winding
XV winding
77
Ya0
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
78
YNa0
A
B
C
I
II
III
-
-
-
1U-1N
1V-1N
1W-1N
2U-2N
2V-2N
2W-2N
2
1
U
U
79
Ya4
A
B
C
I+II
II+III
III+I
-
-
-
1U-1V
1U-1W
1V-1W
2W-2U
2W-2V
2U-2V
2
1
U
U
80
YNa4
A
B
C
I+III
II+I
III+II
-
-
-
1U-1N
1V-1N
1W-1N
2W-2U
2U-2V
2V-2W
2
1
U
U
81
Ya8
A
B
C
II+I
III+II
I+III
1U-1W
1V-1U
1W-1V
1V-(1U+1W)
1W-(1V+1U)
1U-(1W+1V)
2V-2U
2W-2V
2U-2W
2
1
U
U
82
YNa8
A
B
C
I+III
II+I
III+II
-
-
-
1U-1N
1V-1N
1W-1N
2U-2W
2V-2U
2W-2V
2
1
U
U
83
Da
A
B
C
I
II
III
-
-
-
1U-1V
1V-1W
1W-1U
2U-2V
2V-2W
2W-2U
2
1
U
U
84
Za
A
B
C
I
II
III
-
-
-
1U-1V
1V-1W
1W-1U
2U-2V
2V-2W
2W-2U
2
1
U
U
85
ZNa
A
B
C
I
II
III
-
-
-
1U-1V
1V-1W
1W-1U
2U-2V
2V-2W
2W-2U
2
1
U
U
A
1V
1U
1W
*
B
C
2U
2V
2W
A
0
B
C
2U
1U
1V
2V
1W
2W
A
1V
1U
1W
*
B
C
2U
2V
2W
A
1V
1U
1W
B
C
2U
2V
2W
0
A
1V
1U
1W
B
C
2U
2V
2W
*
A
1V
1U
1W
B
C
2U
2V
2W
0
1U
A
1V
1W
C
B
2U
2V
2W
1U
1W
1V
*
C
B
A
2U
2V
2W
1U
1W
1V
*
C
B
A
2U
2V
2W