纳米复合涂层对微米级金属粉尘吸附行为的抑制作用

doi:10.19595/j.cnki.1000-6753.tces.201636

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摘要绝缘子表面吸附的金属粉尘可能引起放电甚至诱发闪络,抑制粉尘在绝缘子表面的吸附对提高气固绝缘系统的可靠性具有重要意义。该文选用纳米碳化硅（nano-SiC）和蒙脱土-纳米二氧化钛（MMT-nano-TiO₂）,分别从调控表面电荷和改善表面粘黏性能的角度,设计了两种纳米复合涂层。实验表明,蒙脱土-二氧化钛纳米复合涂层（MEP）抑制粉尘吸附的效果整体优于碳化硅纳米复合涂层（SEP）,与无涂层绝缘子模型相比,MEP6涂层表面吸附的粉尘分布范围大幅减小,吸附质量降低54%,抑制金属粉尘吸附的效果最优。进一步建立粉尘受力分析模型,将其运动吸附过程划分为启举、飞行和吸附三个阶段,阐释了粉尘吸附的动力学过程。最后,结合表面电荷分布特征、材料间本征粘附特性分析,指出MEP6涂层抑制粉尘吸附效果明显是缘于同时实现了电荷调控与抗粘黏性能的提升。该研究通过引入纳米复合涂层有效抑制了金属粉尘吸附,可为提升绝缘子表面绝缘强度提供新思路。

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关键词 ：金属粉尘, 直流气体绝缘输电线路, 吸附过程, 抑制作用, 纳米复合涂层

Abstract：Aluminum dust adsorbed on insulator surface may induce discharge or even flashover in DC GIL. So, suppressing dust’s adsorption is of great significance to improve the reliability of the gas-solid insulation system. In this study, two kinds of nanocomposite coatings doped with different fillers, nano-SiC and montmorillonite (MMT) with nano-TiO₂, were designed from the perspective of regulating charge and improving surface adhesion properties. The results show that the effect of MMT-TiO₂ nanocomposite coating (MEP) in inhibiting dust adsorption is better than that of SiC nanocomposite coating (SEP). Compared with the uncoated insulator model, the dust distribution range on the surface of MEP6 coating is greatly reduced, and the dust adsorption quality is reduced by 54%. Therefore, MEP6 has the best suppression effect of adsorption. A force analysis model of metal dust is further established to explain the kinetic process of movement and adsorption, and the adsorption process is divided into three stages: lifting, flying and adsorption. Finally, combined with the analysis of surface charge distribution characteristics and intrinsic adhesion characteristics between materials, it is shown that the reason for the prominent effect of MEP6 coating in inhibiting dust adsorption is that it improves charge regulation and anti-adhesion performance at the same time. This work provides a novel idea for improving the insulation strength of the spacer surface by nanocomposite coating to suppress dust adsorption.

Key words： Aluminum dust DC gas insulated transmission line (GIL) adsorption process suppression effect nanocomposite coating

收稿日期: 2020-12-14

PACS:

TM85

基金资助:国家自然科学基金（51737005, 51929701, 52081330507）和北京市自然科学基金（3202031）资助项目

通讯作者: 王健男,1985年生,讲师,硕士生导师,研究方向为GIL绝缘优化与微粒抑制理论。E-mail: wangjian31791@ncepu.edu.cn

作者简介: 王靖瑞男,1996年生,博士研究生,研究方向为气固界面绝缘优化与环保型绝缘气体放电理论。E-mail: wang_jingrui@ncepu.edu.cn

引用本文:

王靖瑞, 李庆民, 刘衡, 王健, 倪潇茹. 纳米复合涂层对微米级金属粉尘吸附行为的抑制作用[J]. 电工技术学报, 2022, 37(12): 3172-3182. Wang Jingrui, Li Qingmin, Liu Heng, Wang Jian, Ni Xiaoru. Suppression Effect of Nanocomposite Coating on the Adsorption Behavior of Micron-Scale Metal Dust. Transactions of China Electrotechnical Society, 2022, 37(12): 3172-3182.

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