Megger TTR310 - Page 76

M
AVTMTTR310 Rev 8 May 2016
64
Table 5-6. Transformer Winding Phase Relationship (Australian Std. 2374, Part 4 - 2003)
Copyright 2009  Megger
Winding Connection Winding Tested
Diag
No.
IEC
Vector
Group
High-Voltage
Winding (HV)
Low-Voltage
Winding (LV)
Phase
Tested
Winding
Shorted
By TTR
High-
Voltage
Winding
Low-
Voltage
Winding
Measured
Turn
Ratio
Remarks
26 Yd1
A
B
C
B
2
- C
2
C
2
- A
2
A
2
- B
2
A
2
-(B
2
+C
2
)
B
2
-(C
2
+A
2
)
C
2
-(A
2
+B
2
)
a
2
- b
2
b
2
- c
2
c
2
- a
2
3LV
5.1HV
v
v
No neutral
accessible
on wye
winding
27 YNd11
A
B
C



A
2
- N
B
2
- N
C
2
- N
a
2
- c
2
b
2
- a
2
c
2
- b
2
HV
LV 3
v
Neutral
accessible
on wye
winding
28 Yd11
A
B
C
B
2
- C
2
C
2
- A
2
A
2
- B
2
A
2
-(B
2
+C
2
)
B
2
-(C
2
+A
2
)
C
2
-(A
2
+B
2
)
a
2
- c
2
b
2
- a
2
c
2
- b
2
3LV
5.1HV
v
v
No neutral
accessible
on wye
winding
29 ZNd0
A
B
C
B
4
- C
4
C
4
- A
4
A
4
- B
4
A
4
- N
B
4
- N
C
4
- N
a
2
- b
2
b
2
- c
2
c
2
- a
2
HV
1.5 LV
Neutral
accessible
on zigzag
winding
30 Zd0
A
B
C
B
4
- C
4
C
4
- A
4
A
4
- B
4
A
4
- (B
4
- C
4
)
B
4
- (C
4
- A
4
)
C
4
- (A
4
- B
4
)
a
2
- b
2
b
2
- c
2
c
2
- a
2
HV
LV
No neutral
accessible
on zigzag
winding
31 ZNd6
A
B
C
B
4
- C
4
C
4
- A
4
A
4
- B
4
A
4
- N
B
4
- N
C
4
- N
b
1
- a
1
c
1
- b
1
a
1
- c
1
HV
1.5 LV
Neutral
accessible
on zigzag
winding