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There is no power loss in open circuit test.

Actually there is iron loss also known as magnetic losses. These include hysteresis and eddy-current losses. This can be described as V1^2/Rc

Where V1 is the primary voltage and Rc is the resistance of the magnetic core.

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Why us the power measured during the open circuit test considered to be approximately equal to the core loss?

During open circuit test on transformer, no load is connected across the secondary side. Hence, the total power drawn by the transformer is only to induce the voltage across the secondary, i.e., core loss AND negligible amount of primary copper loss. As the primary copper losses during open circuit are negligible, it is practice to attribute the open circuit power to core loss.


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What does reading of wattmeter indicate in case of open circuit test of transformer?

In case of open circuit test of transformers we measure iron losses and hence the power lost here is being measured by the wattmeter.


Why in no load test transformer is connected on low voltage side?

A no-load test is done with the normal supply connected in the way the transformer is intended to be used. It is also known as an open-circuit test to distinguish it from a short-circuit test, and its purpose is to measure the power loss in the iron core of the transformer and the no-load current drawn from the supply.


What are the purposes of performing no load test for the transformer?

These two tests are performed on a transformer to determine (i) equivalent circuit of transformer(ii)voltage regulation of transformer(iii) efficiency of transformer. The power required for theseOpen Circuit test and Short Circuit test on transformeris equal to the power loss occurring in the transformer.


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open circuit & short circuit test, insulation resistance test, turns ratio, efficiency, if it is oil cooled then breakdown voltage of oil, voltage regulation and definitely visual inpection...


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