Correntes Transitórias de Inrush e Forças Eletromagnéticas em Transformadores de Potência: Uma Análise Baseada em Engenharia Assistida por Computador

Abstract

This article performs the electromagnetic study of a transformer prototype, through the application of computer simulations with the Finite Element Method (FEM), using the ANSYS Maxwell© program. The study aims to analyze the transient energizing currents in transformers and the consequent Lorentz electromagnetic forces in the equipment windings. For this, the geometry of the transformer windings is designed with divisions, allowing the measurement of radial and axial Lorentz forces at different locations in the windings. Four cases were simulated, each case refers to a reclosing instant in the voltage wave angle. Two cases are recurrent in the bibliography, such as maximum and minimum Inrush current situations. The other two cases are intermediate and proved to be relevant for understanding the operation and design of transformers.