Megger AVTMTTR100 - Page 40

M
AVTMTTR100-ENG Rev 6 Nov 2015
32
Table 5-2. 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
32 Yz11
A+B
B+C
C+A
H
3
- H
2
H
1
- H
3
H
2
- H
1
H
1
-(H
3
+H
2
)
H
2
-(H
1
+H
3
)
H
3
-(H
2
+H
1
)
X
1
- X
3
X
2
- X
1
X
3
- X
2
No
accessible
neutral
33 ZNy5
A+C
B+A
C+B
H
1
- H
0
H
2
- H
0
H
3
- H
0
X
3
- X
1
X
1
- X
2
X
2
- X
3
No
accessible
neutral on
wye winding
34 Zy5
A+C
B+A
C+B
H
3
- H
2
H
1
- H
3
H
2
- H
1
H
1
-(H
3
+H
2
)
H
2
-(H
1
+H
3
)
H
3
-(H
2
+H
1
)
X
3
- X
1
X
1
- X
2
X
2
- X
3
No
accessible
neutral
35 ZNy11
A+B
B+A
C+B
H
1
- H
0
H
2
- H
0
H
3
- H
0
X
1
- X
3
X
2
- X
1
X
3
- X
2
No
accessible
neutral on
wye winding
36 Zy11
A+C
B+A
C+B
H
3
- H
2
H
1
- H
3
H
2
- H
1
H
1
-(H
3
+H
2
)
H
2
-(H
1
+H
3
)
H
3
-(H
2
+H
1
)
X
1
- X
3
X
2
- X
1
X
3
- X
2
No
accessible
neutral
37 Yd1
A
B
C
H
3
- H
2
H
1
- H
3
H
2
- H
1
H
1
-(H
3
+H
2
)
H
2
-(H
1
+H
3
)
H
3
-(H
2
+H
1
)
X
1
- X
2
X
2
- X
3
X
3
- X
1
No
accessible
neutral on
wye winding
V
V
H
X
•
3
2
V
V
H
X
• 3
3
1.5
V
V
X
H
•
V
V
H
X
• 3
3
1.5
V
V
X
H
•
3
1.5
V
V
X
H
•