A 100-kVA, 2500/125-V, 50-Hz, step-downtransformer has the following parameters: R1=1.5Ω, X1= 2.8Ω, R2 = 15mΩ, X2 =20mΩ, Rc1 =3kΩ, Xm1 = 5kΩ The transformer delivers 85% of the rated load ata terminal voltage of 115 V and a power factor of0.866 lagging. Determine (a) the efficiency, and(b) the voltage regulation. Draw the phasordiagram of the transformer. Use the approximate equivalent circuit referredto the secondary side.

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Author:Robert L. Boylestad
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A 100-kVA, 2500/125-V, 50-Hz, step-down
transformer has the following parameters: R1=
1.5Ω, X1= 2.8Ω, R2 = 15mΩ, X2 =20mΩ, Rc1 =
3kΩ, Xm1 = 5kΩ
 The transformer delivers 85% of the rated load at
a terminal voltage of 115 V and a power factor of
0.866 lagging. Determine (a) the efficiency, and
(b) the voltage regulation. Draw the phasor
diagram of the transformer.
 Use the approximate equivalent circuit referred
to the secondary side.

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