What is the lower limit of megger value for 66/11KV power
Transformer ?
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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.
| Is This Answer Correct ? | 18 Yes | 2 No |
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