Análise Computacional De Esforços Eletromecânicos Nos Enrolamentos De Transformadores Ocasionados Por Corrente De Curto-Circuito Utilizando O Método De Elementos Finitos (original) (raw)

2015, Anais do Congresso Nacional de Matemática Aplicada à Indústria

Power transformers are very important equipment for the national electric system, being responsible for viability in the context of transmission and enabling the connection of generators to the consumer centers. Thus, because of its importance the design of these devices must be performed by providing for more severe situations that may be submitted. On the other hand, practice shows numerous failures in these devices, among the most frequent causes stand out efforts by electromechanical windings caused by transient states. In this perspective, the present work aims to analyze through computational method's behavior when subjected to current transformer shorting. For this analysis the finite element method (MEF) modeling of a 50MVA transformer installed in a power generating company in the northern region is used. The method consists of the discretization of a continuous medium in small elements retaining its original character, being a form of numerical solution of a system of partial differential equations. To do so, will be presented in detail all the steps to obtaining the results from the pre-processing, processing, post-processing. Finally, computational analysis will be presented and validated with the calculations presented in the datasheet (datasheet) equipment.