transformer body localised heating

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1200 KVA, Traction transformer  is heated on the body at particular location of area around 1sq.ft. on side wall temperature rises upto 150 deg.C. there is no heating observed on other parts.please send me the solution.

Hi,

 

Which PI device are you using?

 

Could you please send me the schematic?

 

Regards,

PI-NANO