Answer Posted / dinesh lokhande

As such values mentioned above are not same for all
transformers. Because Insulation resistance consist of
summation of resistance value for composite dielectric. i.e
dielectric consist of paper, oil, metal part, wooden
barriers etc which can be considered as several
capacitances in series.
Point here is we have to find out polarisation index

PI = Megger value after 10 mins / Megger value after 1 min.

PI as a normal practice and also mentioned in some
technical papers should be more than 1.3

Considering PI we can judge measured Insulation resistance
values of insulation.

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