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The transformer has no moving parts, so that its efficiency is much higher than that of rotating machines.
Core losses are hysteresis and eddy-current losses resulting from alternations of magnetic flux in the core. The core loss is a constant loss for a transformer operated at constant voltage and frequency as are all power frequency equipment.
Copper loss occurs in winding resistance when the transformer carries the load current.
Stray load loss largely results from leakage field inducing eddy currents in the tank wall and conductors.
Dielectric losses occurs in dielectric materials such as oil ducts, papers etc in varing the electric field. Here, the losses are dissipated in the form of heat energy. Dielectric losses depend on frequency and the dielectric materials of Transformer.
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