Answer / arvind

There are two basic purpose of % impedance of transformer.
1. We can check the fault level of the transformer.
2. During the parallel operation of transformer, both transformer % impedance should be identical for load sharing. other wise which transformer has less impedance it will take more load.
its the basic need of parallel operation for two transformer.

Answer / guest

%impedance is to know the short circuit current of
transformer,depend on transformer ratings , for ex: 1600kva
6%,20 mva 10%

Answer / suseendran

It is the output voltage drop when transformer is fully
loaded..... This can be measured by conducting short circuit
test.....

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along with technical test papers

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