Determinação dos esforços eletromecânicos em transformadores de potência causados por correntes de inrush utilizando simulações multifísicas.

Abstract

This study aims to investigate the electromechanical efforts acting in power transformer windings when the equipment is turned on. Analytical and computational methods were used to determine the electromechanical efforts in a three-phase 100 MVA transformer. By the results analyzing, it was observed that, despite the inrush current, has much lower amplitude than the three-phase short-circuit current, it was able to generate forces in the transformer of the same order of magnitude from those generated by the short circuit. Moreover, it was also verified that computer simulations, based on the Finite Element Method, are more suitable, when compared with the analytical modeling of electromechanical efforts. Thus, this work presents a contribution to a topic still scarce in the literature, as well as a methodology that allows the evaluation of electromechanical efforts in transformer windings, caused by inrush currents, utilizing multiphysics simulations. The methodology can assist in the equipment design stage.