掺杂纳米Al<sub>2</sub>O<sub>3</sub>对纤维绝缘纸电寿命的影响及机理

doi:10.19595/j.cnki.1000-6753.tces.171531

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摘要纳米Al₂O₃掺杂能有效提升纤维绝缘纸的热寿命,为进一步探究其对纤维绝缘纸电寿命的影响,在实验室制备了纳米Al₂O₃改性纤维绝缘纸（质量分数为2%的掺杂量）和普通纤维绝缘纸手抄片,均采用矿物油进行真空浸渍后作为对比研究对象。在多样品绝缘材料电老化试验平台上,对两种油浸绝缘纸分六种不同电压开展加速电老化试验,以绝缘击穿失效作为寿命终点,利用电寿命反幂函数模型,分别计算并对比了其寿命指数,并对其介电性能进行测试。结果表明,相较于改性前的油浸绝缘纸,改性后的油浸绝缘纸具有更低的相对介电常数及介质损耗,寿命指数提高了20%,具有更高的抗电老化性能及更长的电寿命。最后,结合改性前后介质中电场分布、介质损耗及传导电流变化,分析了纳米Al₂O₃掺杂对油纸绝缘电寿命的影响机理。

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	莫洋
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关键词 ：纤维素绝缘纸, 纳米Al₂O₃, 电老化, 电寿命

Abstract：Nanometer Al₂O₃ doping has been proved to be effective in improving the thermal life of cellulose insulation paper. In order to explore its further effect on the electrical life of cellulose insulation paper, nano-Al₂O₃ modified cellulose insulation paper (2% doping amount) and ordinary cellulose insulation paper were prepared in the laboratory. All the experiment samples were impregnated with mineral insulating oil under the same condition. Then the two kinds of samples were carried out accelerating aging test under 6 ranks of voltage with the multi-sample insulation material electrical aging test platform. Taking insulation breakdown failure as the end of life, inverse power function as the electrical aging lifetime model, the index of life expectancy was compared. The results show that, compared to the unmodified oil impregnated paper, modified oil impregnated paper has lower relative dielectric constant and dielectric loss. Moreover, the life index increased by 20%, with higher dielectric aging performance and longer life. Finally, the mechanism of nano-Al₂O₃ doping on the electrical life of oil paper insulation was analyzed in terms of the electric field distribution, dielectric loss and conduction current change before and after modification.

Key words： Cellulose insulation paper nano Al₂O₃ electrical aging electrical aging lifetime

收稿日期: 2017-11-07 出版日期: 2018-10-15

PACS:

TM215.6

基金资助:国家自然科学基金资助项目（51777019）

作者简介: 莫洋男,1994年生,博士研究生,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：moyang_cqu@163.com（通信作者）;杨丽君女,1980 年生,博士,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。E-mail：yljcqu@cqu.edu.cn

引用本文:

莫洋, 杨丽君, 鄢水强, 廖瑞金, 袁媛. 掺杂纳米Al₂O₃对纤维绝缘纸电寿命的影响及机理[J]. 电工技术学报, 2018, 33(19): 4618-4626. Mo Yang, Yang Lijun, Yan Shuiqiang, Liao Ruijin, Yuan Yuan. Influence and Mechanism of Doped Nano-Al₂O₃ on Electrical Life of Cellulose Insulating Paper. Transactions of China Electrotechnical Society, 2018, 33(19): 4618-4626.

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