Megger TTR310 - Page 77

SETUP AND CONNECTIONS
AVTMTTR310 Rev 8 May 2016
65
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
32 Zd6
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
)
HV
LV
No neutral
accessible
on zigzag
winding
33 ZNy1
C+A
A+B
B+C



A
4
- N
B
4
- N
C
4
- N
a
2
- b
2
b
2
- c
2
c
2
- a
2
HV
LV
v 3
No
accessible
neutral on LV
winding
34 Zy1
C+A
A+B
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
3
1.5
V
V
X
H
v
No neutral
accessible
on HV & LV
windings
35 ZNy11
A+C
B+A
C+B



A
4
- N
B
4
- N
C
4
- N
a
2
- c
2
b
2
- a
2
c
2
- b
2
HV
LV v 3
No
accessible
neutral on LV
winding
36 Zy11
A+C
B+A
C+B
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
- c
2
b
2
- a
2
c
2
- b
2
3
1.5
V
V
X
H
v
No neutral
accessible
on HV & LV
windings
37 ZNyn11
A+C
B+A
C+B
__
A
4
- N
B
4
- N
C
4
- N
a
2
- c
2
b
2
- a
2
c
2
- b
2
HV
LV v 3
Neutral
accessible
on HV & LV
windings
n