Megger TTR310 - Page 68

M
AVTMTTR310 Rev 8 May 2016
56
Table 5-5. CEI/IEC 76-1:2011 Transformer Winding Phase Relationship
Copyright 2009  Megger
Winding Connection Winding Tested
Diag
No.
IEC
Vector
Group
High-Voltage
Winding (U1)
Low-Voltage
Winding (U2)
Phase
Tested
Winding
Shorted
By TTR
High-
Voltage
Winding
Low-
Voltage
Winding
Measured
Turn Ratio
Remarks
45
YNd1
U
V
W



1U-1N
1V-1N
1W-1N
2U-2V
2V-2W
2W-2U
32U
1U
v
Neutral
accessible
on wye
winding
46
Yd1
U
V
W
1V-1W
1W-1U
1U-1V
1U-(1V+1W)
1V-(1W+1U)
1W-(1U+1V)
2U-2V
2V-2W
2W-2U
32U
5.1*1U
v
No neutral
accessible
on wye
winding
47
YNd5
U
V
W



1U-1N
1V-1N
1W-1N
2W-2U
2U-2V
2V-2W
32U
1U
v
Neutral
accessible
on wye
winding
48 Yd5
U
V
W
1V-1W
1W-1U
1U-1V
1U-(1V+1W)
1V-(1W+1U)
1W-(1U+1V)
2W-2U
2U-2V
2V-2W
32U
5.1*1U
v
No neutral
accessible
on wye
winding
49 YNd7
U
V
W



1U-1N
1V-1N
1W-1N
2V-2U
2W-2V
2U-2W
32U
1U
v
Neutral
accessible
on wye
winding
50 Yd7
U
V
W
1V-1W
1W-1U
1U-1V
1U-(1V+1W)
1V-(1W+1U)
1W-(1U+1V)
2V-2U
2W-2V
2U-2W
32U
5.1*1U
v
No neutral
accessible
on wye
winding