Megger TTR310 - Page 65

SETUP AND CONNECTIONS
AVTMTTR310 Rev 8 May 2016
53
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
27
Dzn10
U
V
W
1V-1W
1W-1U
1U-1V
1U-(1V+1W)
1V-(1W+1U)
1W-(1U+1V)
2N-2W
2N-2U
2N-2V
1.5U1
U2
Neutral
accessible
on zigzag
winding
28
Dz10
U
V
W



1U-1V
1V-1W
1W-1U
2U-2W
2V-2U
2W-2V
U1
U2
No neutral
accessible
on zigzag
winding
29
YNyn0
U
V
W



1U-1N
1V-1N
1W-1N
2U-2N
2V-2N
2W-2N
U1
U2
Neutral
accessible
on HV & LV
winding
30
YNy0
U
V
W
1V-1N
1W-1N
1U-1N
1U-1N
1V-1N
1W-1N
2U-2V
2V-2W
2W-2U
U1
U2
No neutral
accessible
on LV
winding
31
Yyn0
U+V
V+W
W+U



1U-1V
1V-1W
1W-1U
2U-2V
2V-2W
2W-2U
U1
U2
No neutral
accessible
on HV
winding
32
Yy0
U+V
V+W
W+U



1U-1V
1V-1W
1W-1U
2U-2V
2V-2W
2W-2U
U1
U2
No neutral
accessible
on HV & LV
windings