Method for Rating and Analyzing the Combined Effects of Moisture and Temperature on the Oil–Paper Insulation System of Power Transformers by Means of Load Variations

Journal of control, automation and electrical systems

article

de Carvalho Sousa, Felipe Resende¹  de Jesus Ribeiro, Cacilda¹  Pereira Marques, André³  da Cunha Brito, Leonardo¹ 

[1] School of Electrical, Mechanical and Computer Engineering, Federal University of Goiás;Enel Distribuição Goiás;Federal Institute of Education, Science and Technology of Goiás;APMarques Consulting and Training in Electrical Engineering

关键词: Bubbles;    Diagnostics;    Moisture;    Rating system;    Power transformers;   

DOI  :  10.1007/s40313-020-00607-7

学科分类：自动化工程

来源: Springer

【 摘 要 】

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.

【 授权许可】

CC BY