Estudo teórico e experimental do fenômeno de ferroressonância em transformadores.

Abstract

Ferroresonance is an electromagnetic transient event of non-linear and sustained character that may be responsible for the appearance of high values of voltage and current in power system equipment. The transformer core magnetic characteristics give the non-linear character to the phenomenon and, due to those features, there may be various responses in steady or transient state for different system parameters. This paper aimed to develop a study to show how this phenomenon may arise. The behavior of transformers was analyzed when there was a series configuration between capacitors and inductors in the system. The simulation tool used for the analysis was Simscape, which is a Matlab tool, and in order to validate the results, a laboratory test with a single-phase transformer was performed. According to the analysis of the results found, the appearance of ferroresonance in the transformer was observed through the influence of the variation of the parameters of the circuit and the type of maneuver carried out in the primary winding of the three-phase transformer.