Análise eletromagnética de transformador trifásico utilizando método de elementos finitos

Abstract

Three-phase transformers are crucial devices in the Power Electrical System (PES), which demands the pursuit of reliability and efficiency. Being complex devices, the validation and testing of transformers, especially high-power ones, present significant challenges. Employing simulations like the Finite Element Method (FEM) in the design stage of the electrical machine allows for the analysis of transformer performance with different types of ferromagnetic materials and geometries, identifying the best configurations for thermal, electromagnetic, and mechanical behavior. The main objective of this work is to perform the electromagnetic analysis of a three-phase transformer using FEM when subjected to different electrical load conditions. Using Ansys Electronics software, the modeling of the three-phase transformer, its electrical and magnetic configurations, and simulations with different levels of electrical load were carried out to analyze the currents and voltages in the transformer, as well as the distribution of magnetic field density in the core. The obtained electromagnetic results were compared with the data provided by the manufacturer. Through this analysis, it was possible to conclude that the voltage and current results for the no-load condition showed values close to the theoretical ones. There was little variation in the voltage and current values for the different electrical load conditions applied to the device, but they remained within the normal range of the transformer’s theoretical operation. Some differences were found in the maximum magnetic field density flux due to the characteristics of the core material’s B-H curve.