Megger TTR310 - Page 67

SETUP AND CONNECTIONS
AVTMTTR310 Rev 8 May 2016
55
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
39
Yzn5
U
V
W



1U-1V
1V-1W
1W-1U
2N-2U
2N-2V
2N-2W
U1 3
U2
v
With or
without
accessible
neutral on
wye winding
40
Yz5
U
V
W
1V-1W
1W-1U
1U-1V
1U-(1V+1W)
1V-(1W+1U)
1W-(1U+1V)
2W-2U
2U-2V
2V-2W
U1
U2
v
3
2
No neutral
accessible
on HV & LV
windings
41
Yzn7
U
V
W



1U-1V
1V-1W
1W-1U
2V-2N
2W-2N
2U-2N
U1 3
U2
v
Neutral
accessible
on wye
winding
42
Yz7
U
V
W
1V-1W
1W-1U
1U-1V
1U-(1V+1W)
1V-(1W+1U)
1W-(1U+1V)
2V-2U
2W-2V
2U-2W
U1
U2
v
3
2
No neutral
accessible
on HV & LV
windings
43
Yzn11
U
V
W



1U-1V
1V-1W
1W-1U
2U-2N
2V-2N
2W-2N
U1 3
U2
v
With or
without
accessible
neutral on
wye winding
44
Yz11
U
V
W
1V-1W
1W-1U
1U-1V
1U-(1V+1W)
1V-(1W+1U)
1W-(1U+1V)
2U-2W
2V-2U
2W-2V
U1
U2
v
3
2
No neutral
accessible
on HV & LV
windings