Megger TTR310 - Page 75

SETUP AND CONNECTIONS
AVTMTTR310 Rev 8 May 2016
63
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
20 Yy6
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 & LV
windings
21 Yzn1
A+B
B+C
C+A



A
2
- B
2
B
2
- C
2
C
2
- A
2
n - b
4
n - c
4
n - a
4
HV
LV
v 3
With or
without
neutral
accessible
on wye
winding
22 Yz1
A+C+A+B
B+A+C+B
C+B+C+A
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
4
- b
4
b
4
- c
4
c
4
- a
4
HV
LV
v
3
2
No neutral
accessible
on HV & LV
windings
23 Yzn11
A+B
B+C
C+A



A
2
- B
2
B
2
- C
2
C
2
- A
2
a
4
- n
b
4
- n
c
4
- n
HV
LV
v 3
With or
without
neutral
accessible
on wye
winding
24 Yz11
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
4
- c
4
b
4
- a
4
c
4
- b
4
HV
LV
v
3
2
No neutral
accessible
on HV & LV
windings
25 YNd1
A
B
C



A
2
- N
B
2
- N
C
2
- N
a
2
- b
2
b
2
- c
2
c
2
- a
2
HV
LV
v 3
Neutral
accessible
on wye
winding