This paper presents an innovative method devised to study some of the harmful effects of moisture on power transformers, considering the possible formation of bubbles and free water. Its novelty stems from the fact that it comprises: (a) a rating system from "A" to "E" and their respective recommended actions and (b) an analysis that involves varying the different levels of electrical loads applied to the equipment. The importance of this work is confirmed when power transformers are exposed to unfavorable conditions that can critically affect their insulation. To this end, a tool to study moisture was developed, which uses the finite difference method, based not only on the experience of experts/analysts but also on existing studies in the area and on the analysis of a database of actual field tests. The contribution of this work is an efficient method, implemented via a computational algorithm, which provides a technique for the real-time or offline rating of power transformers, helping maintenance teams to diagnose problems and decide whether or not to repair the equipment. The tool provided the satisfactory results, which are presented in a case study of a real transformer operating at the local electric utility company. These results were obtained by applying different levels of electrical loads, for which thermal simulations were performed.
Você tinha o hábito de revisar o conteúdo de Cálculo 1 no mesmo dia da aula? 62 219 9 Você participou ou participa de algum projeto de pesquisa ou extensão 179 102 10 Você usa transporte público para vir à UFPA? 226 55 11 Você mora com a família? 235 46 12 Você mora em Belém? 232 49 13 Você possui renda própria? 49 232 Fonte: Elaborado pelos autores As informações obtidas por meio do questionário foram cadastradas no software IBM SPSS. De posse dos dados registrados iniciou-se a segunda etapa do procedimento, a criação de um modelo matemático obtido via regressão logística. Como o questionário utilizado só possui perguntas cujas
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