What is the lower limit of megger value for 66/11KV power Transformer ?

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What is the lower limit of megger value for 66/11KV power
Transformer ?

Question Posted / a.h.patel

7 Answers
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MSETCL Maharashtra State Electricity Transmission Co Ltd, Torrent Power, I also Faced
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What is the lower limit of megger value for 66/11KV power Transformer ?..

Answer / 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

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What is the lower limit of megger value for 66/11KV power Transformer ?..

Answer / karan

the meggar value depend on insulation level,
but we can inicate in thumb rule,
& thumb rule is
minimum meggar(IR)value is per KV 5megaohmas

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13 Yes

1 No

What is the lower limit of megger value for 66/11KV power Transformer ?..

Answer / ravi

Which Value????

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18 Yes

10 No

What is the lower limit of megger value for 66/11KV power Transformer ?..

Answer / hasan mehdi

50 M Ohms

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16 Yes

8 No

What is the lower limit of megger value for 66/11KV power Transformer ?..

Answer / uday pratap singh

5 Mega ohm per kV.

Is This Answer Correct ?

5 Yes

1 No

What is the lower limit of megger value for 66/11KV power Transformer ?..

Answer / venkatesh

minimum 200-250Mohms

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5 Yes

2 No

What is the lower limit of megger value for 66/11KV power Transformer ?..

Answer / naveen kumar mishra

mndnnv

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4 Yes

3 No

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