Question

# Tests are performed on a 1- phase, 10 kVA, 2200/220 V, 60 Hz transformer and the following results are obtained. Open circuit -testshort circuit -test(HV side open)(LV side shorted)Voltmeter220 V150 VAmmeter2.5 A4.55 AWattmeter100 W215 W The approximate equivalent circuit is :

A
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B
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C
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D
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Solution

## The correct option is C Lets take circuit referred to low voltage side, Watt meter reading = VIcosϕ cosϕ=100220×2.5=0.1818 sinϕ=sin(cos−1(0.1818))=0.9833 Ic=I0cosϕ=2.5×0.1818=0.4545 A Im=I0sinϕ=2.5×0.9833=2.46 A ∴Rc=VIc=2200.4545=484 Ω ∴Xm=VIm=2202.46=89.43 Ω ∴ option c is the only equivalent circuit matching.

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