Megger TTR20, Instruction Manual

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M
AVTMTTR20 Rev 4 Dec 2015
52
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
49 YNzn7
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
50 YNzn11
A
B
C H
1
- H
3
H
2
- H
1
H
3
- H
2
X
0
- X
3
X
0
- X
1
X
0
- X
2
Neutral
accessible
on wye
winding
51 YNd3
A
B
C
__
H
1
-H
0
H
2
-H
0
H
3
-H
0
X
3
-X
2
X
1
-X
3
X
2
-X
1
Neutral
accessible
on wye
winding
52 YNd9
A
B
C
__
H
1
-H
0
H
2
-H
0
H
3
-H
0
X
2
-X
3
X
3
-X
1
X
1
-X
2
Neutral
accessible
on wye
winding
53 Yd3
A
B
C
H
3
-H
2
H
1
-H
3
H
2
-H
1
H
1
-(H
2
+H
3
)
H
2
-(H
3
+H
1
)
H
3
-(H
1
+H
2
)
X
3
-X
2
X
1
-X
3
X
2
-X
1
No
accessible
neutral on
wye winding
54 Yd9
A
B
C H
3
-H
2
H
1
-H
3
H
2
-H
1
H
1
-(H
2
+H
3
)
H
2
-(H
3
+H
1
)
H
3
-(H
1
+H
2
)
X
2
-X
3
X
3
-X
1
X
1
-X
2
No
accessible
neutral on
wye winding
55 YNyn2
A
B
C
__
H
1
-H
0
H
2
-H
0
H
3
-H
0
X
0
– X
2
X
0
– X
3
X
0
– X
1
Neutral
accessible
both wye
windings
56 YNyn8
A
B
C
__
H
1
-H
0
H
2
-H
0
H
3
-H
0
X
2
- X
0
X
3
- X
0
X
1
- X
0
Neutral
accessible
both wye
windings
V
V
H
X
•
3
V
V
H
X
•
3
3 V
V
X
H
•
3 V
V
X
H
•
3
1.5
V
V
X
H
•
3
1.5
V
V
X
H
•
V
V
H
X
V
V
H
X
XO
XO
*
*