The problem of heating power transformers when working with a non-linear load.

The connection between the heating of power transformers and nonlinear distortion of the current curve is shown. Distortion is created by non-linear electrical loads. The heating is caused by the higher harmonics of the electric current flowing through the transformer. The necessity of solving the problem of heating transformers in the presence of a large share of nonlinear consumers of electricity in their load has been substantiated. The results of the analysis of voltage and current sinusoidal distortions of transformers with a predominance of nonlinear load are presented. It was revealed that the harmonic coefficients exceeded the values admissible by the standards. In the spectrum of harmonics, the third harmonic has the highest percentage. The simulation of an electrical network with a transformer and nonlinear load in the MATLAB environment has been performed. The results are obtained for the original network and the network with the installed passive filter. The filter is designed for the third harmonic of the electric current. As a result of the simulation, a significant reduction in the current harmonic coefficient was obtained after installing a passive filter. Analysis of other methods of reducing the temperature of the transformer from the influence of higher harmonics of the current showed the advantage for the substations under consideration of the method for reducing the load of transformers by installing an additional transformer. [ABSTRACT FROM AUTHOR]