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Influence of Surface Discharge on Resin Degradation in Decay-like Fracture of Composite Insulators

Composite insulators have gradually become the preferred approach for electrical insulation in power systems, especially in polluted areas. Composite insulators consist of three main components: the shed, rod, and end fitting. Insulators withstand mechanical stresses via rods that are composed of gl...

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Detalles Bibliográficos
Autores principales: Wang, Qian, Bao, Weining, Gao, Yanfeng, Liu, Shuqi, Liu, Shuming, Zuo, Zhou, Wu, Chao, Liang, Xidong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9966747/
https://www.ncbi.nlm.nih.gov/pubmed/36850074
http://dx.doi.org/10.3390/polym15040790
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author Wang, Qian
Bao, Weining
Gao, Yanfeng
Liu, Shuqi
Liu, Shuming
Zuo, Zhou
Wu, Chao
Liang, Xidong
author_facet Wang, Qian
Bao, Weining
Gao, Yanfeng
Liu, Shuqi
Liu, Shuming
Zuo, Zhou
Wu, Chao
Liang, Xidong
author_sort Wang, Qian
collection PubMed
description Composite insulators have gradually become the preferred approach for electrical insulation in power systems, especially in polluted areas. Composite insulators consist of three main components: the shed, rod, and end fitting. Insulators withstand mechanical stresses via rods that are composed of glass-fiber-reinforced epoxy (GFRE). However, regardless of the high tensile strength of GFRE rods, in real-life operation, abnormal fractures have frequently been reported all over the world, which substantially increase the risk of major accidents in power systems. Fractural accidents mainly consist of brittle and decay-like fractures, which exhibit rather different morphologies at the cross sections. Brittle fracture has been effectively eliminated, while the mechanism of decay-like fracture has still not been clearly revealed. In this study, surface discharge tests were applied to investigate the discharge influence on the degradation of GFRE. The test successfully simulated the composition variation of the rods in real-life composite insulators with decay-like fractures. Moreover, it confirmed that the distinction between the characteristics of brittle fracture and decay-like fracture stems from epoxy degradation due to hydrolysis and carbonization. In addition, the respective influences of the resin type, glass fiber type, and acid liquid immersion on the degradation process were probed, and the degradation mechanism proposed in this research was verified. Based on the results, measures for preventing the development of decay-like fractures in real-life operations were determined.
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spelling pubmed-99667472023-02-26 Influence of Surface Discharge on Resin Degradation in Decay-like Fracture of Composite Insulators Wang, Qian Bao, Weining Gao, Yanfeng Liu, Shuqi Liu, Shuming Zuo, Zhou Wu, Chao Liang, Xidong Polymers (Basel) Article Composite insulators have gradually become the preferred approach for electrical insulation in power systems, especially in polluted areas. Composite insulators consist of three main components: the shed, rod, and end fitting. Insulators withstand mechanical stresses via rods that are composed of glass-fiber-reinforced epoxy (GFRE). However, regardless of the high tensile strength of GFRE rods, in real-life operation, abnormal fractures have frequently been reported all over the world, which substantially increase the risk of major accidents in power systems. Fractural accidents mainly consist of brittle and decay-like fractures, which exhibit rather different morphologies at the cross sections. Brittle fracture has been effectively eliminated, while the mechanism of decay-like fracture has still not been clearly revealed. In this study, surface discharge tests were applied to investigate the discharge influence on the degradation of GFRE. The test successfully simulated the composition variation of the rods in real-life composite insulators with decay-like fractures. Moreover, it confirmed that the distinction between the characteristics of brittle fracture and decay-like fracture stems from epoxy degradation due to hydrolysis and carbonization. In addition, the respective influences of the resin type, glass fiber type, and acid liquid immersion on the degradation process were probed, and the degradation mechanism proposed in this research was verified. Based on the results, measures for preventing the development of decay-like fractures in real-life operations were determined. MDPI 2023-02-04 /pmc/articles/PMC9966747/ /pubmed/36850074 http://dx.doi.org/10.3390/polym15040790 Text en © 2023 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Wang, Qian
Bao, Weining
Gao, Yanfeng
Liu, Shuqi
Liu, Shuming
Zuo, Zhou
Wu, Chao
Liang, Xidong
Influence of Surface Discharge on Resin Degradation in Decay-like Fracture of Composite Insulators
title Influence of Surface Discharge on Resin Degradation in Decay-like Fracture of Composite Insulators
title_full Influence of Surface Discharge on Resin Degradation in Decay-like Fracture of Composite Insulators
title_fullStr Influence of Surface Discharge on Resin Degradation in Decay-like Fracture of Composite Insulators
title_full_unstemmed Influence of Surface Discharge on Resin Degradation in Decay-like Fracture of Composite Insulators
title_short Influence of Surface Discharge on Resin Degradation in Decay-like Fracture of Composite Insulators
title_sort influence of surface discharge on resin degradation in decay-like fracture of composite insulators
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9966747/
https://www.ncbi.nlm.nih.gov/pubmed/36850074
http://dx.doi.org/10.3390/polym15040790
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