Answer / k.prakashchandra

Comprehensive test before commissioning and at least once in
a year preferably soon after rainy season.BDV to be measured
at least once in a quarter.Filtering is to be done only if
necessary.Generally fresh oil does not require comprehensive
test.

Answer / bharani

At least once in two years. Approximately, once in seven
years the PH of the oil is to be tested, and afer fileration
if the PH is found to be around 4, then you have to change
the oil.

Answer / guest

before filling in to the transformer.

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