Why a Transformer Noise during its running condition ??

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Why a Transformer Noise during its running condition ??..

Answer / kashifhabib

Transformer consists of Mineral Oil for Insulation & Cooling
purposes.
When Current flows through wingdings, Primary or Secondary
winding(s) heat up (That depends upon T/F is step up or
satep down). Oil absorb the heat & cool the winding(s.

This oil heat up, 7 this noise is due to this oil.

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