Megger AVTMTTR100 - Page 49

SETUP AND CONNECTIONS
AVTMTTR100-ENG Rev 6 Nov 2015
41
Table 5-3. 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
Neutral
accessible
on zigzag
winding
28 Dz10
U
V
W
1U-1V
1V-1W
1W-1U
2U-2W
2V-2U
2W-2V
No neutral
accessible
on zigzag
winding
29 YNyn0
U
V
W
1U-1N
1V-1N
1W-1N
2U-2N
2V-2N
2W-2N
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
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
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
No neutral
accessible
on HV & LV
windings
1.5U1
U2
U1
U2
U1
U2
U1
U2
U1
U2
U1
U2