Megger AVTMTTR100 - Page 57

SETUP AND CONNECTIONS
AVTMTTR100-ENG Rev 6 Nov 2015
49
Table 5-4. Transformer Winding Phase Relationship (Australian Std. 2374, Part 4 - 2003)
Copyright 2009 Megger
Winding Connection Winding Tested
Diag
No.
IEC
Vector
Group
High-Voltage
Winding (HV)
Low-Voltage
Winding (LV)
Phase
Tested
Winding
Shorted
By TTR
High-
Voltage
Winding
Low-
Voltage
Winding
Measured
Turn
Ratio
Remarks
14
YNy0
A
B
C
B2 - N
C2 - N
A2 - N
A2 - N
B2 - N
C2 - N
a2 - b2
b2 - c2
c2 - a2
HV
LV
No
accessible
neutral on LV
winding
15
Yyn0
A+B
B+C
C+A
A2 - B2
B2 - C2
C2 - A2
a2 - b2
b2 - c2
c2 - a2
HV
LV
No neutral
accessible
on HV
winding
16
Yy0
A+B
B+C
C+A
A2 - B2
B2 - C2
C2 - A2
a2 - b2
b2 - c2
c2 - a2
HV
LV
No neutral
accessible
on HV & LV
windings
17
YNyn6
A
B
C
A2 - N
B2 - N
C2 - N
n - a1
n - b1
n - c1
HV
LV
Neutral
accessible
on HV & LV
windings
18
YNy6
A
B
C
B2 - N
C2 - N
A2 - N
A2 - N
B2 - N
C2 - N
b1- a1
c1- b1
a1- c1
HV
LV
No neutral
accessible
on LV
winding
19
Yyn6
A+B
B+C
C+A
A2 - B2
B2 - C2
C2 - A2
b1 - a1
c1 - b1
a1 - c1
HV
LV
No neutral
accessible
on HV
winding