Ways to Research and Reduce the Higher Harmonics in the Electromotive Force from the Power Transformers for Various of Loads

Regardless of the many factors on which the performance of a power transformer depends, it must be able to reduce the higher harmonics (in the electromotive force in a certain degree), independent of the non-sinusoidal currents that flow through it - determined by the power source or consumer of the electrical energy. The reduction of higher harmonics is particularly important, because they are the cause of the deterioration of the performance of the power transformer - increasing its temperature and losses, and last but not least, reducing its power that can be used. The article provides information on the effect of power transformer loading on the harmonic composition of in the electromotive force on the secondary winding of the power transformer. The studies were done in the area of the rated load of the transformer (at a certain step) and at different loads. Plans are presented for future research that builds on the findings presented in this article.