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Answer Posted / ilononurb
we can take the break down voltage of transformer oil by
using oil tester. Take oil sample of tr oil and put in to
the testing oil pot with the spere electrode of 2.5mm gap.
Applied gradually the voltage till the oil losses its
dielectric stenght. breakdown voltage will display to the
oiltester meter. As per IEC 156 Standards it should be
40kv.eff.
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