纳米MgO/环氧树脂复合材料的陷阱特性及对电树枝特性的影响研究  

Study on Trap Properties of Nano-MgO/Epoxy Resin Composites and Its Influence on Electrical Tree Properties

作　　者：程子霞[1] 邢威威 张云霄[2] 周远翔[2,3] 滕陈源 Cheng Zixia;Xing Weiwei;Zhang Yunxiao;Zhou Yuanxiang;Teng Chenyuan(School of Electrical Engineering Zhengzhou University,Zhengzhou 450001 China;State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University,Beijing 100084 China;The Wind Solar Storage Division of State Key Laboratory of Power System and Generation Equipment School of Electrical Engineering Xinjiang University,Urumqi 830047 china)

机构地区：[1]郑州大学电气工程学院,郑州450001 [2]电力系统及发电设备安全控制和仿真国家重点实验室(清华大学电机系),北京100084 [3]电力系统及大型发电设备安全控制和仿真国家重点实验室(新疆大学电气工程学院)风光储分室,乌鲁木齐830047

出　　处：《电工技术学报》2022年第21期5562-5569,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51907101,51977186);新能源电力系统国家重点实验室开放课题(LAPS20006)资助项目。

摘　　要：随着电压等级的不断提升,因电树枝老化而导致的绝缘材料失效问题日益严重。为研究纳米MgO对环氧树脂电树枝老化的影响,制备了不同MgO填充量(质量分数0~1%)的纳米MgO/环氧树脂复合材料,对其电树枝的起始和生长过程进行观测。结果表明,在微量填充下,纳米MgO/环氧树脂复合材料的耐电树枝性能随填充量的增加而提高。当纳米MgO质量分数为1%时,纳米MgO/环氧树脂复合材料的起树概率降低了45%、电树枝长度降低为纯环氧树脂的1/3、交流击穿场强提高了14.1%。由介电特性和陷阱特性分析可得,随填充量的增加,复合材料的介电常数减小,陷阱能级加深。纳米MgO的加入提高了复合材料的陷阱能级,降低了载流子的迁移率和浓度,进而提高了纳米MgO/环氧树脂复合材料的耐电树枝性能。With the continuous improvement of voltage level,the failure of insulation materials caused by the aging of electrical tree is becoming more and more serious.In order to study the effect of nano-MgO on the aging of epoxy resin electrical tree,nano-MgO/epoxy resin composites with different mass fractions(0~1%)were prepared,and the initiation and growth process of electrical tree were observed.The results show that the electrical tree resistance of nano-MgO/epoxy resin composites increases with the increase of filling ratio under slight filling.When the mass fraction of nano-MgO is 1%,the tree initiation probability of nano-MgO/epoxy resin composites is reduced by 45%,the electrical tree length is reduced to about 1/3 of that of pure epoxy resin,and the corresponding AC breakdown field strength is increased by 14.1%.According to the analysis of the dielectric properties and trap properties,with the increase of filling ratio,the dielectric constant of the composite decreases and the trap energy level deepens.With the addition of nano-MgO,the trap energy level of the composite was increased,and the carrier mobility and concentration were decreased,which improved the electrical tree resistance of nano-MgO/epoxy resin composite.

关 键 词：环氧树脂 纳米MgO 电树枝 介电特性 陷阱 

分 类 号：TM215[一般工业技术—材料科学与工程]