{"title":"Electrical tree degradation of MgO/epoxy resin composites at different voltage frequencies","authors":"Yunxiao Zhang, Wenxin Lin, Yuanxiang Zhou, Weiwei Xing, Jiayu Cheng, Chenyuan Teng","doi":"10.1049/hve2.12407","DOIUrl":null,"url":null,"abstract":"<p>Electrical tree degradation is one of the main causes of insulation failure in high-frequency transformers. Electrical tree degradation is studied on pure epoxy resin (EP) and MgO/EP composites at frequencies ranging from 50 Hz to 130 kHz. The results show that the tree initiation voltage of EP decreases, while the growth rate and the expansion coefficient increase with frequency. Moreover, the bubble phenomenon at high frequencies in EP composites is discussed. Combined with trap distribution characteristics within the material, the intrinsic mechanism of epoxy composites to inhibit the growth of the electrical tree at different frequencies is discussed. It can be concluded that more deep traps and blocking effect are introduced by doping nano-MgO into EP bulks, which can improve the electrical tree resistance performance of EP composites in a wide frequency range.</p>","PeriodicalId":48649,"journal":{"name":"High Voltage","volume":"9 3","pages":"581-590"},"PeriodicalIF":4.4000,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/hve2.12407","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"High Voltage","FirstCategoryId":"5","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1049/hve2.12407","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
Abstract
Electrical tree degradation is one of the main causes of insulation failure in high-frequency transformers. Electrical tree degradation is studied on pure epoxy resin (EP) and MgO/EP composites at frequencies ranging from 50 Hz to 130 kHz. The results show that the tree initiation voltage of EP decreases, while the growth rate and the expansion coefficient increase with frequency. Moreover, the bubble phenomenon at high frequencies in EP composites is discussed. Combined with trap distribution characteristics within the material, the intrinsic mechanism of epoxy composites to inhibit the growth of the electrical tree at different frequencies is discussed. It can be concluded that more deep traps and blocking effect are introduced by doping nano-MgO into EP bulks, which can improve the electrical tree resistance performance of EP composites in a wide frequency range.
电树降解是高频变压器绝缘失效的主要原因之一。研究了纯环氧树脂（EP）和氧化镁/EP 复合材料在 50 Hz 至 130 kHz 频率范围内的电树退化情况。结果表明，EP 的电树引发电压会降低，而生长率和膨胀系数则会随着频率的增加而增大。此外，还讨论了 EP 复合材料在高频下的气泡现象。结合材料内部的陷阱分布特征，讨论了环氧树脂复合材料在不同频率下抑制电树生长的内在机制。可以得出结论，在 EP 体中掺入纳米氧化镁可以引入更多的深陷阱和阻滞效应，从而改善 EP 复合材料在宽频率范围内的抗电树性能。
High VoltageEnergy-Energy Engineering and Power Technology
CiteScore
9.60
自引率
27.30%
发文量
97
审稿时长
21 weeks
期刊介绍：
High Voltage aims to attract original research papers and review articles. The scope covers high-voltage power engineering and high voltage applications, including experimental, computational (including simulation and modelling) and theoretical studies, which include:
Electrical Insulation
● Outdoor, indoor, solid, liquid and gas insulation
● Transient voltages and overvoltage protection
● Nano-dielectrics and new insulation materials
● Condition monitoring and maintenance
Discharge and plasmas, pulsed power
● Electrical discharge, plasma generation and applications
● Interactions of plasma with surfaces
● Pulsed power science and technology
High-field effects
● Computation, measurements of Intensive Electromagnetic Field
● Electromagnetic compatibility
● Biomedical effects
● Environmental effects and protection
High Voltage Engineering
● Design problems, testing and measuring techniques
● Equipment development and asset management
● Smart Grid, live line working
● AC/DC power electronics
● UHV power transmission
Special Issues. Call for papers:
Interface Charging Phenomena for Dielectric Materials - https://digital-library.theiet.org/files/HVE_CFP_ICP.pdf
Emerging Materials For High Voltage Applications - https://digital-library.theiet.org/files/HVE_CFP_EMHVA.pdf
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