纳米Al<sub>2</sub>O<sub>3</sub>掺杂对绝缘纸热老化电气特性的影响

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摘要

为探究纳米Al₂O₃掺杂对纤维素绝缘纸热老化条件下电气特性的影响,在实验室制备了纳米Al₂O₃掺杂质量分数为2%的复合绝缘纸和普通绝缘纸手抄片,浸油后形成油纸复合绝缘样品,并在130 ℃老化箱中开展加速热老化试验。试验测试了不同老化阶段纳米复合纸与普通纸的电气参数及油纸老化产物,研究了纳米Al₂O₃掺杂提升绝缘纸电气性能的机理,并分析得到了老化过程对绝缘纸电气性能的影响规律。研究结果表明:掺杂纳米Al₂O₃的复合绝缘纸具有较好的交直流电气特性和抗热老化性能,认为纳米Al₂O₃的“介电双层”结构有效减弱了绝缘纸内界面极化和转向极化,降低了绝缘纸的相对介电常数及介质损耗。纳米Al₂O₃掺杂可以有效降低绝缘纸中载流子迁移率,增大其体积电阻率。Al₂O₃的高热导率及其与纤维素间的连接作用增大了绝缘纸热导率,加速了绝缘纸内热量扩散,提升了绝缘纸抗热老化性能。

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关键词 ：绝缘纸, 纳米Al₂O₃, 电气特性, 热老化, 热导率

Abstract：

In order to study the effect of nano-Al₂O₃ on the electrical properties of insulation paper under thermal aging, composite paper with 2% nano-Al₂O₃ and conventional paper were prepared, then the accelerated thermal aging test under 130 ℃ with conventional oil-paper and nano-Al₂O₃ composite oil-paper were performed. The main electrical parameters of paper and aging products in oil-paper system were tested. The modification mechanisms of nano-Al₂O₃ on electrical properties were researched, and the variations in properties of insulation paper during aging process were analyzed. The research results show that nano-Al₂O₃ improves the electrical properties and anti-aging ability of composite paper. The electric double layer structure of nano-Al₂O₃ can weaken the interfacial polarization and dipole polarization, which reduces the permittivity and dielectric loss. It is considered that nano-Al₂O₃ effectively decreases the carrier mobility and increases the volume resistivity of composite paper. High thermal conductivity of Al₂O₃ and the connection structure between nano-Al₂O₃ and cellulose chains may increase the thermal conductivity of insulation paper and accelerate the heat diffusion in composite paper, so that the anti-aging ability of composite paper gets enhanced.

Key words： Insulation paper nano-Al₂O₃ electrical properties thermal aging thermal conductivity

收稿日期: 2016-03-23 出版日期: 2017-06-20

PACS:

TM215.6

基金资助:

国家自然科学基金(51437001)、国家创新研究群体基金(51321063)和中国电力科学研究院科技项目(GY71-14-001)资助

通讯作者: 鄢水强男,1993年生,硕士研究生,研究方向为电气设备绝缘在线监测与故障诊断和新型绝缘材料。E-mail:ysq@cqu.edu.cn

作者简介: 廖瑞金男,1963年生,教授,博士生导师,研究方向电气设备绝缘在线监测与故障诊断和高电压测试技术。E-mail:rjliao@cqu.edu.cn

引用本文:

鄢水强, 廖瑞金, 吕彦冬, 赵学童, 何利华. 纳米Al₂O₃掺杂对绝缘纸热老化电气特性的影响[J]. 电工技术学报, 2017, 32(11): 225-232. Yan Shuiqiang, Liao Ruijin, Lü Yandong, Zhao Xuetong, He Lihua. Influence of Nano-Al₂O₃ on Electrical Properties of Insulation Paper under Thermal Aging. Transactions of China Electrotechnical Society, 2017, 32(11): 225-232.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2017/V32/I11/225

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