Electrical tree degradation of MgO/epoxy resin composites at different voltage frequencies
作者机构：Fuzhou Univ Coll Elect Engn & Automat Fujian Key Lab New Energy Generat & Power Convers Fuzhou Peoples R China Tsinghua Univ Dept Elect Engn State Key Lab Control & Simulat Power Syst & Gener Beijing Peoples R China
出 版 物：《HIGH VOLTAGE》 (高电压（英文）)
年 卷 期：2024年第9卷第3期
页 面：581-590页
核心收录：
学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
基 金：National Natural Science Foundation of China Natural Science Foundation of Fujian Province [2022J01112, SKLD22KZ10] State Key Laboratory of Power System and Generation Equipment 92266110
主 题：EPOXY-RESIN PARTIAL DISCHARGE CABLE INSULATION SILICONE-RUBBER GROWTH WAVE TEMPERATURE DEPENDENCE EVOLUTION
摘 要：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.
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