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Answer Posted / uzy
whenever current flows through a wire there are i2rt losses
which r dissipated through resistors in the form of heat
also transformer has no moving part so all the
losses(unusable energy) in copper winding are evolving
through wires.
moreover the construction of transformer is closed type so
the heating becomes more.
since the oil tank is linked to the windings , as the
windings
heatup the oil filled in tank get heated and expands.
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