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A 50 kVA, 1000/200 V transformer takes 5 A current at a power factor of 0.2 lagging, when connected to 1000 V side at no load is connected at the other side. The core loss in transformer will be:

A 50 kVA, 1000/200 V transformer takes 5 A current at a power factor of 0.2 lagging, when connected to 1000 V side at no load is connected at the other side. The core loss in transformer will be: Correct Answer 1000 W

Concept:

Core loss is constant in transformer irrespective of supply-side whether the rated supply voltage is applied on high voltage side or low voltage side.

No load core loss is given by

Pcore = V I0 cosϕ0

Where V = rated no load supply voltage

I0 = No load current

Cosϕ0 = no load power factor

Calculation:

No load copper loss = 1000 × 5 × 0.2 = 1000 watt

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