So the three-phase transformer is rated 7200 V -- 208 V
208 V
V
x
207.846V
=
V
x
3
V
xLN
⋅
=
The line voltage on the secondary will the the square root of three times the line to
neutral voltage, so
V
xLN
120V
=
V
xLN
V
srated
=
The low side is connected in wye, so the line to neutral voltage will be equal to the
coil rating of each phase
V
h
7.2kV
=
V
h
V
prated
=
Since the high side is connected delta, the line voltage will be equal to the coil
rating of each phase
b.
a.
H1
H2
X1
X2
H1
H2
X1
X2
H1
H2
X1
X2
Delta-Wye Connection
A
B
C
n
a
b
c
Solution
S
rated
10 kVA
⋅

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