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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

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Abstract

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.

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Authors and Affiliations

  1. School of Electrical, Mechanical and Computer Engineering, Federal University of Goiás, Goiânia, GO, Brazil

    Felipe Resende de Carvalho Sousa, Cacilda de Jesus Ribeiro & Leonardo da Cunha Brito

  2. Enel Distribuição Goiás, Goiânia, GO, Brazil

    Felipe Resende de Carvalho Sousa

  3. Federal Institute of Education, Science and Technology of Goiás, Goiânia, GO, Brazil

    André Pereira Marques

  4. APMarques Consulting and Training in Electrical Engineering, Goiânia, GO, Brazil

    André Pereira Marques

Authors
  1. Felipe Resende de Carvalho Sousa
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  2. Cacilda de Jesus Ribeiro
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  3. André Pereira Marques
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  4. Leonardo da Cunha Brito
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Correspondence to Felipe Resende de Carvalho Sousa.

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de Carvalho Sousa, F.R., de Jesus Ribeiro, C., Pereira Marques, A. et al. 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. J Control Autom Electr Syst 31, 1309–1321 (2020). https://doi.org/10.1007/s40313-020-00607-7

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  • DOI: https://doi.org/10.1007/s40313-020-00607-7

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