Megger TTR310 - Page 74

M
AVTMTTR310 Rev 8 May 2016
62
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
14 YNy0
A
B
C
B
2
- N
C
2
- N
A
2
- N
A
2
- N
B
2
- N
C
2
- N
a
2
- b
2
b
2
- c
2
c
2
- a
2
HV
LV
No
accessible
neutral on LV
winding
15 Yyn0
A+B
B+C
C+A



A
2
- B
2
B
2
- C
2
C
2
- A
2
a
2
- b
2
b
2
- c
2
c
2
- a
2
HV
LV
No neutral
accessible
on HV
winding
16 Yy0
A+B
B+C
C+A



A
2
- B
2
B
2
- C
2
C
2
- A
2
a
2
- b
2
b
2
- c
2
c
2
- a
2
HV
LV
No neutral
accessible
on HV & LV
windings
17 YNyn6
A
B
C



A
2
- N
B
2
- N
C
2
- N
n - a
1
n - b
1
n - c
1
HV
LV
Neutral
accessible
on HV & LV
windings
18 YNy6
A
B
C
B
2
- N
C
2
- N
A
2
- N
A
2
- N
B
2
- N
C
2
- N
b
1
- a
1
c
1
- b
1
a
1
- c
1
HV
LV
No neutral
accessible
on LV
winding
19 Yyn6
A+B
B+C
C+A



A
2
- B
2
B
2
- C
2
C
2
- A
2
b
1
- a
1
c
1
- b
1
a
1
- c
1
HV
LV
No neutral
accessible
on HV
winding