Raytech TR-1 - Interpreting Three Phase Transformer Results; Three Phase Ratio Calculation Chart; Example: Y:D Transformer Ratio Calculation

Raytech USA, Inc. All rights reserved Ver. 1.13 17
Transformer type
Winding measurement
Vector Group
HV Side
LV Side
Phase
HV Winding
LV Winding
A
H1-(H2H3)
:
X1-X0
Y-zn 1
B
H2-(H1H3)
:
X2-X0
C
H3-(H1H2)
:
X3-X0
A
H1-(H2H3)
:
X0-X2
Y-zn 3
B
H2-(H1H3)
:
X0-X3
C
H3-(H1H2)
:
X0-X1
A
H1-(H2H3)
:
X3-X0
Y-zn 5
B
H2-(H1H3)
:
X1-X0
C
H3-(H1H2)
:
X2-X0
A
H1-(H2H3)
:
X0-X1
Y-zn 7
B
H2-(H1H3)
:
X0-X2
C
H3-(H1H2)
:
X0-X3
A
H1-(H2H3)
:
X2-X0
Y-zn 9
B
H2-(H1H3)
:
X3-X0
C
H3-(H1H2)
:
X1-X0
A
H1-(H2H3)
:
X0-X3
Y-zn 11
B
H2-(H1H3)
:
X0-X1
C
H3-(H1H2)
:
X0-X2
A
H1-(H2H3)
:
X1-X2
Y-d 1
B
H2-(H1H3)
:
X2-X3
C
H3-(H1H2)
:
X3-X1
A
H1-(H2H3)
:
X3-X2
Y-d 3
B
H2-(H1H3)
:
X1-X3
C
H3-(H1H2)
:
X2-X1
A
H1-(H2H3)
:
X3-X1
Y-d 5
B
H2-(H1H3)
:
X1-X2
C
H3-(H1H2)
:
X2-X3
A
H1-(H2H3)
:
X2-X1
Y-d 7
B
H2-(H1H3)
:
X3-X2
C
H3-(H1H2)
:
X1-X3
A
H1-(H2H3)
:
X2-X3
Y-d 9
B
H2-(H1H3)
:
X3-X1
C
H3-(H1H2)
:
X1-X2
A
H1-(H2H3)
:
X1-X3
Y-d 11
B
H2-(H1H3)
:
X2-X1
C
H3-(H1H2)
:
X3-X2