Megger TTR310 - Page 64

M
AVTMTTR310 Rev 8 May 2016
52
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
21
Dzn4
U
V
W
1V-1W
1W-1U
1U-1V
1U-(1V+1W)
1V-(1W+1U)
1W-(1U+1V)
2W-2N
2U-2N
2V-2N
1.5U1
U2
Neutral
accessible
on zigzag
winding
22
Dz4
U
V
W



1U-1V
1V-1W
1W-1U
2W-2U
2U-2V
2V-2W
U1
U2
No neutral
accessible
on zigzag
winding
23
Dzn6
U
V
W
1V-1W
1W-1U
1U-1V
1U-(1V+1W)
1V-(1W+1U)
1W-(1U+1V)
2N-2U
2N-2V
2N-2W
1.5U1
U2
Neutral
accessible
on zigzag
winding
24
Dz6
U
V
W



1U-1V
1V-1W
1W-1U
2V-2U
2W-2V
2U-2W
U1
U2
No neutral
accessible
on zigzag
winding
25
Dzn8
U
V
W
1V-1W
1W-1U
1U-1V
1U-(1V+1W)
1V-(1W+1U)
1W-(1U+1V)
2V-2N
2W-2N
2U-2N
1.5U1
U2
Neutral
accessible
on zigzag
winding
26
Dz8
U
V
W



1U-1V
1V-1W
1W-1U
2V-2W
2W-2U
2U-2V
U1
U2
No neutral
accessible
on zigzag
winding