The new power system for renewable energy and high proportional power electronic equipment, the harmonic component is seriously increased and complicated, and it is easy to cause overheating, aging, and even misuse operations, which brings significant hidden dangers in safe operation of electric equipment. This paper analyzes the magnetic field distribution characteristics of the transformer with different proportion of harmonic currents under the action of the 110KV AC transformer magnetic field and the temperature field model, and calculate the transformer winding error loss; combined with temperature field model, simulation analysis of communication superimposed different ratios Effect of harmonic current on the hot spot temperature of the transformer winding. The results show that as the proportion of the overlay harmonic current increases, the transformer winding edging increasing increases, and the winding temperature of the winding is also gradually increased. The emergence of harmonic current results in a more significant transformer winding heat problem.

Harmonic current,AC transformer,Hot spot temperature,Eddy current loss,Temperature Distribution