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what is the minimum dielectric stregth of transformer oil.
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Answer Posted / pundlik wanwe
transformer oil BD value is a relative term and as a matter
of fact we can use the oil of different break down value
depending on the transformer voltage ratings.
1) For the transformer voltage rating more or equal to 145
kv BD value of oil should be more than 65 kv and moisture
content should be below 15 ppm.
2)for the voltage rating below 145 KV BD value should be
45KV and moisture content of less than 25 ppm.
More more information please refer
a) IS: 1866 for oil in service.
b) IS: 335 for new oil
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