Answer / mrudang

if oil has low dielectric strength , ur transformer is in
warning condition ,

why ?? because of in transformer , there is high voltage
winding , it create high temperature , oil is dielectric
medium of two windings , if dielectric strength is low
that means ur oil has moisture content , and it is also
affect the paper insulation of transformer winding

so dielectric strength is very important

Answer / loboreliance2003

dielectric strength of transformer oil should be above 30KV
for 1 min. testing of the transformer oil sample should be
done properly. Ensure no oil bubbles are formed and wait
for bubbles to settle before taking the test.

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