Answer / arpit sood

an important test is the tan delta test or the dissipation
factor test
This is carried out with the help of an automatic scherring
bridge to measure the capacitance of the insulation
this is a measure of the integrity of the insulation or the
life expectancy of the transformer
the value of the dissipation factor should be more than or
equal to 0.7

Answer / sadineni sreedhar

we are carried out the below tests
1)IR-insulation resistance
2)turns ratio test
3)winding resistance test
4)automatic capacitance and tan delta or dissipation test
5)short circuit and open circuit test
6)vector group test

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