Megger TTR310 - Page 55

SETUP AND CONNECTIONS
AVTMTTR310 Rev 8 May 2016
43
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
38
YNd5
A
B
C

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
Neutral
accessible
on wye
winding
39
Yd5
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
3
- X
1
X
1
- X
2
X
2
- X
3
3
1.5
V
V
X
H
v
No
accessible
neutral on
wye winding
40
Yd7
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
2
- X
1
X
3
- X
2
X
1
- X
3
3
1.5
V
V
X
H
v
No
accessible
neutral on
wye winding
41
YNd11
A
B
C

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
Neutral
accessible
on wye
winding
42
Yd11
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
3
X
2
- X
1
X
3
- X
2
3
1.5
V
V
X
H
v
No
accessible
neutral on
wye winding