Megger TTR310 - Page 54

M
AVTMTTR310 Rev 8 May 2016
42
Table 5-4. 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
V
V
H
X
v
3
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
V
V
H
X
v 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
3
1.5
V
V
X
H
v
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
V
V
H
X
v 3
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
3
1.5
V
V
X
H
v
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
3
1.5
V
V
X
H
v
No
accessible
neutral on
wye winding