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what is the minimum dielectric stregth of transformer oil.
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Answer Posted / irfan ahmed farooqui
For a new insulating transformer oil(called virgin oil),
the,
value is 70kv for a good satisfactory level but, where as
oil in use (called in service) has values ranging from 25
kv to 50kv , depending upon various factors like ,running
hours of use, impurities, moisture content, sludge content
etc, but it is advisable to discard old oil, if value does
not improve after dehydration and filteration above 60 KV
in laboratory setup or the oil has not passing a
compatibility/mixibilty test with new transformer oil at
different ratio to come to at par in usable ranges as per
standards, on the other hand the exact values and correct
figures for Virgin oil are available in IEC-60296 AND for
oil in service there is a complete guide and specification
available as IEC-60247 where all the nesseccary
informations are available,including the test methods and
apparatus required.
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