Electrical-Mechanical Model of Electrical Breakdown of Epoxy-Impregnated-Paper Insulated Tubular Busbar With Bubble Defects
Insulated tubular busbar is a new type of current-carrying equipment with excellent performance. However, the research on this equipment is insufficient because of the short application and the lack of technical digestion, which has resulted in many accidents. In this paper, the full-scale model of...
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2020-01-01
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doaj-52e0e28e243441668e84cce8c23d457e2021-03-30T04:16:20ZengIEEEIEEE Access2169-35362020-01-01819793119793810.1109/ACCESS.2020.30349019245587Electrical-Mechanical Model of Electrical Breakdown of Epoxy-Impregnated-Paper Insulated Tubular Busbar With Bubble DefectsXiang Ren0https://orcid.org/0000-0002-3101-4531Ling Ruan1Haiyun Jin2Guanjun Zhang3Electric Power Research Institute, State Grid Hubei Electric Power Company Ltd., Wuhan, ChinaElectric Power Research Institute, State Grid Hubei Electric Power Company Ltd., Wuhan, ChinaState Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an, ChinaState Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an, ChinaInsulated tubular busbar is a new type of current-carrying equipment with excellent performance. However, the research on this equipment is insufficient because of the short application and the lack of technical digestion, which has resulted in many accidents. In this paper, the full-scale model of epoxy-impregnated-paper insulated tubular busbar with bubble defects was designed and produced, its electrical breakdown process was investigated by withstand voltage test. In the experiment, the failure mode of breakdown caused by gas expansion was found for the first time. The research showed that the electrical-mechanical breakdown process could be divided into two stages: gas increase stage and breakdown threshold stage. The research also obtained the characteristics and the change criterions of the two stages. The gas in the bubble defects generated from epoxy decomposition which caused by partial discharge. When the gas pressure exceeds the critical fracture toughness of the bubble defects wall, the unstable crack extension occurs, therefore, improving the ability about resistance to partial discharge of epoxy resin or improving the fracture toughness of epoxy resin by modifying would enhance the breakdown performance of insulated tubular busbar. The result also has reference significance for other epoxy-impregnated-paper insulated electrical equipment.https://ieeexplore.ieee.org/document/9245587/Electrical breakdownepoxy-impregnated-paper insulated tubular busbarfracture toughnesspartial discharge |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Xiang Ren Ling Ruan Haiyun Jin Guanjun Zhang |
spellingShingle |
Xiang Ren Ling Ruan Haiyun Jin Guanjun Zhang Electrical-Mechanical Model of Electrical Breakdown of Epoxy-Impregnated-Paper Insulated Tubular Busbar With Bubble Defects IEEE Access Electrical breakdown epoxy-impregnated-paper insulated tubular busbar fracture toughness partial discharge |
author_facet |
Xiang Ren Ling Ruan Haiyun Jin Guanjun Zhang |
author_sort |
Xiang Ren |
title |
Electrical-Mechanical Model of Electrical Breakdown of Epoxy-Impregnated-Paper Insulated Tubular Busbar With Bubble Defects |
title_short |
Electrical-Mechanical Model of Electrical Breakdown of Epoxy-Impregnated-Paper Insulated Tubular Busbar With Bubble Defects |
title_full |
Electrical-Mechanical Model of Electrical Breakdown of Epoxy-Impregnated-Paper Insulated Tubular Busbar With Bubble Defects |
title_fullStr |
Electrical-Mechanical Model of Electrical Breakdown of Epoxy-Impregnated-Paper Insulated Tubular Busbar With Bubble Defects |
title_full_unstemmed |
Electrical-Mechanical Model of Electrical Breakdown of Epoxy-Impregnated-Paper Insulated Tubular Busbar With Bubble Defects |
title_sort |
electrical-mechanical model of electrical breakdown of epoxy-impregnated-paper insulated tubular busbar with bubble defects |
publisher |
IEEE |
series |
IEEE Access |
issn |
2169-3536 |
publishDate |
2020-01-01 |
description |
Insulated tubular busbar is a new type of current-carrying equipment with excellent performance. However, the research on this equipment is insufficient because of the short application and the lack of technical digestion, which has resulted in many accidents. In this paper, the full-scale model of epoxy-impregnated-paper insulated tubular busbar with bubble defects was designed and produced, its electrical breakdown process was investigated by withstand voltage test. In the experiment, the failure mode of breakdown caused by gas expansion was found for the first time. The research showed that the electrical-mechanical breakdown process could be divided into two stages: gas increase stage and breakdown threshold stage. The research also obtained the characteristics and the change criterions of the two stages. The gas in the bubble defects generated from epoxy decomposition which caused by partial discharge. When the gas pressure exceeds the critical fracture toughness of the bubble defects wall, the unstable crack extension occurs, therefore, improving the ability about resistance to partial discharge of epoxy resin or improving the fracture toughness of epoxy resin by modifying would enhance the breakdown performance of insulated tubular busbar. The result also has reference significance for other epoxy-impregnated-paper insulated electrical equipment. |
topic |
Electrical breakdown epoxy-impregnated-paper insulated tubular busbar fracture toughness partial discharge |
url |
https://ieeexplore.ieee.org/document/9245587/ |
work_keys_str_mv |
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