纳米SiO<sub>2</sub>/芳纶绝缘纸复合材料的空间电荷特性和介电性能

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摘要为提高油纸绝缘系统的绝缘寿命,提出将纳米SiO₂粒子改性的芳纶绝缘纸应用于直流输变电设备的方法。在加压和去压短路条件下,测试了不同纳米SiO₂含量的芳纶绝缘纸试样的空间电荷特性、热刺激去极化电流、直流击穿强度和体积电阻率。结果表明：添加纳米SiO₂使芳纶绝缘纸的线均电荷密度明显低于纯芳纶纸试样;随纳米SiO₂含量的增加,试样平均电荷密度衰减速率呈现先减小后增大的变化趋势;SiO₂的添加增加了芳纶纸内部深陷阱和浅陷阱的密度;纳米SiO₂含量为1wt%时直流击穿强度最大;芳纶纸的体积电阻率随纳米SiO₂含量增加呈单调递增趋势。机理分析表明纳米SiO₂粒子浓度过高时,其分散性变差导致其对芳纶纸性能的改善作用变弱。

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关键词 ：芳纶绝缘纸, 二氧化硅, 纳米改性, 空间电荷, 热刺激电流, 击穿强度, 体积电阻率

Abstract：In order to apply aramid paper in the DC power transmission equipment to increase the life expectancy, the method of nano-SiO₂ particle modified aramid insulation paper is proposed to improve the space charge properties and DC dielectric properties. The aramid insulation paper samples with different nano-SiO₂ contents wad presented. The space charge characteristics, the thermally stimulated depolarization current (TSDC), DC breakdown voltage and volume resistivity of aramid papers with different SiO₂ contents were measured respectively under increasing voltage and short circuit conditions. The results show that nano-SiO₂ could efficiently prevent the space charge injection. The medium charge density of nano-modified aramid paper samples is smaller than that of the pure aramid paper sample during the voltage-on process. With the increasing percentage of nano-SiO₂, the decay rate decreases at the first and then increases. The result of TSDC indicates that nano-SiO₂ increases the density of deep trap and shallow trap simultaneously. The DC breakdown strength of the sample with 1%wt nano-SiO₂ is the maximum. The volume resistivity of aramid papers increases with the increasing of nano-SiO₂ content. When the concentration of nano-particle is too high, the improvement of aramid paper performance is weakened as a result of poor dispersion.

Key words： Aramid paper silicon dioxide nano-modification space charge thermally stimulated current breakdown strength volume resistivity

收稿日期: 2014-12-26 出版日期: 2016-07-12

PACS:

TM215.4

基金资助:国家重点基础研究发展计划（973计划）资助项目（2009CB724505-1）

作者简介: 作者简介廖瑞金男,1963年生,教授,博士生导师,研究方向为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柳海滨男,1990年生,硕士研究生,研究方向为输变电设备绝缘在线监测与故障诊断和新型绝缘材料。E-mail: lhbcqu@cqu.edu.cn

引用本文:

廖瑞金, 柳海滨, 柏, 舸, 郝, 建, 李, 萧, 林元棣. 纳米SiO₂/芳纶绝缘纸复合材料的空间电荷特性和介电性能[J]. 电工技术学报, 2016, 31(12): 40-48. Liao Ruijin, Liu Haibin, Bai Ge, Hao Jian, Li Xiao, Lin Yuandi. Space Charge Characteristics and Dielectric Properties of Nano-SiO₂/Aramid Paper Composite. Transactions of China Electrotechnical Society, 2016, 31(12): 40-48.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I12/40

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