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.....

Why dont we get shock while testing for voltage with a line tester? How the bulb inside the tester glows while testing with tester coz we are totaly isolated from earth or we are not giving close path for the current to flow?

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