Megger TTR20 - Table C-2. ANSI Transformer Winding Phase Relationship

M
AVTMTTR20 Rev 4 Dec 2015
44
Table C-2. ANSI Transformer Winding Phase Relationship
Copyright 2009 Megger
Winding Connection Winding Tested
Diag
No.
IEC
Vector
Group
High-Voltage
Winding (H)
Low-Voltage
Winding (X)
Phase
Tested
Winding
Shorted
By TTR
High-
Voltage
Winding
Low-
Voltage
Winding
Measured
Turn Ratio Remarks
1
1
1ph0
1
H
1
- H
2
X
1
- X
2
Single-phase
transformer
2
1
1ph6
1
H
1
- H
2
X
2
- X
1
Single-phase
transformer
3 Dd0
A
B
C
H
1
- H
3
H
2
- H
1
H
3
- H
2
X
1
- X
3
X
2
- X
1
X
3
- X
2
4 Dd6
A
B
C
H
1
- H
3
H
2
- H
1
H
3
- H
2
X
3
- X
1
X
1
- X
2
X
2
- X
3
5 Dyn1 A
B
C
H
1
- H
3
H
2
- H
1
H
3
- H
2
X
1
- X
0
X
2
- X
0
X
3
- X
0
Neutral
accessible
on wye
winding
6 Dyn7
A
B
C
H
1
- H
3
H
2
- H
1
H
3
- H
2
X
0
- X
1
X
0
- X
2
X
0
- X
3
Neutral
accessible
on wye
winding
7 YNyn0
A
B
C
H
1
- H
0
H
2
- H
0
H
3
- H
0
X
1
- X
0
X
2
- X
0
X
3
- X
0
Neutral
accessible
both wye
windings
V
V
H
X
V
V
H
X
V
V
H
X
V
V
H
X
V
V
H
X
• 3
V
V
H
X
• 3
V
V
H
X