Answer / 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.

Answer / moti rgpv

THERE ARE I*I*R LOSS IS RESISTIVE COIL WHICH IS ONLY
RESPONSIBLE FOR HEAT INCRIMENT IN X-MER

Answer / ladna(ladna_mekelive@yahoo.com

from conservation of energy,energy is neither created nor
destroyed,but converted from one form to another.
Thus,as current flows in the windings and encounter
some resistance,work is done by an agent t overcome this
resistance.
The result is that there will be heat(remember the
conseration of energy law stated above), from electricity.

why aggregate is placed all around substation ground.

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