等离子体表面阶跃型梯度硅沉积对环氧树脂闪络性能的影响

doi:10.19595/j.cnki.1000-6753.tces.210476

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摘要气体绝缘输电线路内的盆式绝缘子长期处于非均匀电场中,局部高场强引起的表面电荷积聚会进一步畸变外部电场,造成局部放电甚至引发沿面闪络。常规均匀改性手段难以兼顾不同场强区域的绝缘需求,对整体绝缘性能的提升难以达到最佳效果。该文采用大气压等离子体射流技术实现氧化铝/环氧树脂表面的等离子体阶跃型梯度硅沉积,测量了改性前后材料的理化特性和表面电气参数。结果表明,采用等离子体表面阶跃型梯度硅沉积会在材料表面覆盖不同厚度的硅氧类薄膜,使样片的表面粗糙度、表面电导率和陷阱能级呈阶跃型梯度分布,进而调控样片表面不同区域的电荷消散速率,使沿面闪络电压最多提升31.1%,明显高于未改性和均匀改性材料。分析表明,一方面构造梯度分布的表面电导率可以有效降低针-针电极的最大电场强度,减小电场畸变;另一方面,加快高场强区表面电荷消散并适当控制低场强区表面电荷消散速率时,才能最大程度地提升材料沿面闪络性能。

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	闫纪源
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	康玉婵
	彭程凯
	谢庆

关键词 ：等离子体, 环氧树脂, 梯度改性, 表面电荷, 沿面闪络

Abstract：The basin insulator in gas insulated transmission line is suffered from the non-uniform electric field for a long time. The surface charge accumulation caused by local high field intensity will further distort the external electric field, which will trigger to the partial discharge and even the flashover along the surface. The conventional uniform modification method is difficult to take into account the insulation requirements of different field strength areas, and it is difficult to achieve the best effect on the overall insulation performance. In this paper, atmospheric pressure plasma jet technology are used to realize step plasma gradient silicon deposition on the surface alumina/epoxy resin surface. The results show that the material surface is covered with different thickness of silicon oxide film by step gradient plasma silicon deposition, which can construct step gradient distribution of surface roughness, surface conductivity and trap level. This method can control the charge dissipation rate of different surface areas, and increase the flashover voltage up to 31.1% at most, which is significantly higher than that of unmodified and uniformly modified materials. The analysis shows that, on the one hand, the surface conductivity with gradient distribution can effectively reduce the maximum electric field strength of needle electrodes and reduce the electric field distortion. On the other hand, when the surface charge dissipation in high field intensity region is accelerated and the surface charge dissipation rate is properly controlled, the advantages of plasma silicon deposition can be exerted and the adverse effects can be reduced, and the flashover performance of the material along the surface can be improved to the maximum extent.

Key words： Plasma epoxy resin gradient modification surface charge surface flashover

收稿日期: 2021-04-06

PACS:

TM215.1

基金资助:国家自然科学基金（51777076）和新能源电力系统国家重点实验室自主研究课题（LAPS202116）资助项目

通讯作者: 谢庆男,1979年生,教授,博士生导师,研究方向为高电压与绝缘技术。E-mail：xq_ncepu@126.com

作者简介: 闫纪源男,1995年生,博士研究生,研究方向为电工新材料改性与绝缘技术。E-mail：yjy_ncepu@foxmail.com

引用本文:

闫纪源, 梁贵书, 段祺君, 阮浩鸥, 康玉婵, 彭程凯, 谢庆. 等离子体表面阶跃型梯度硅沉积对环氧树脂闪络性能的影响[J]. 电工技术学报, 2022, 37(9): 2377-2387. Yan Jiyuan, Liang Guishu, Duan Qijun, Ruan Haoou, Kang Yuchan, Peng Chengkai, Xie Qing. Effect of Plasma Surface Step Gradient Silicon Deposition on Flashover Properties of Epoxy Resin. Transactions of China Electrotechnical Society, 2022, 37(9): 2377-2387.

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