等离子体射流快速改性促进表面电荷衰减

发布时间：2018-01-10 07:06

本文关键词：等离子体射流快速改性促进表面电荷衰减　出处：《电工技术学报》2017年16期 　论文类型：期刊论文

【摘要】：随着高压直流输电迅猛发展,绝缘材料在直流电压下表面电荷积聚现象严重威胁直流输电系统的安全可靠运行。为加快绝缘材料表面电荷的消散,采用大气压等离子体射流,以TEOS为前驱物,在环氧树脂表面沉积SiO_x薄膜。对改性前后材料表面化学组成、表面电导率、表面电荷特性、表面陷阱分布以及耐压特性进行多参数测量,研究等离子体射流改性前后环氧树脂表面特性。实验结果表明:等离子体处理在环氧树脂表面引入大量以Si-O-Si及Si-OH基团为主的无机基团,且表面电导率提高2个数量级。随着改性时间的延长,表面电荷的初始积聚量减少,消散速度加快,陷阱能级深度变浅;沿面闪络电压呈现先增后降的趋势,在改性180s时闪络电压提高到最高值9.0k V。研究结果表明:通过大气压等离子体射流在聚合物表面沉积薄膜能够提高环氧树脂绝缘性能,为其工程应用提供了有效的改性方法。
[Abstract]:With the rapid development of HVDC transmission, the phenomenon of surface charge accumulation at DC voltage seriously threatens the safe and reliable operation of HVDC system. SiO_x films were deposited on epoxy resin surface by atmospheric pressure plasma jet and TEOS as precursor. The surface chemical composition, surface conductivity and surface charge characteristics of the materials before and after modification were studied. The surface trap distribution and voltage characteristics are measured with multiple parameters. The surface characteristics of epoxy resin before and after plasma jet modification were studied. The experimental results showed that a large number of inorganic groups, mainly Si-O-Si and Si-OH groups, were introduced into the surface of epoxy resin by plasma treatment. The surface conductivity increases by two orders of magnitude. With the increase of modification time, the initial accumulation of surface charge decreases, the velocity of dissipation accelerates, and the depth of trap energy level becomes shallow. The flashover voltage along the surface increases first and then drops. The flashover voltage was increased to a maximum value of 9.0kV at 180s. The results show that the insulating properties of epoxy resin can be improved by deposition of films on polymer surface by atmospheric pressure plasma jet. It provides an effective modification method for its engineering application.
【作者单位】：华北电力大学电气与电子工程学院;中国科学院电工研究所;中国科学院大学;
【基金】：国家自然科学基金面上项目(11575194) 国家重点基础研究发展计划(973计划)(2014CB239505-3) 中央高校基本科研业务费专项资金(2016ZZD07) 河北省自然科学基金面上项目(E2015502081)资助
【分类号】：TM21
【正文快照】： 0引言直流输电具有系统稳定、调节快速、运行可靠、造价便宜等优点,适用于大容量远距离输电[1]。在我国电力系统不断发展及直流输电电压等级不断提高的时代背景下,高压设备的绝缘问题面临日益严峻的挑战。在直流电场下绝缘材料表面更易产生电荷积聚现象,由此引起电场畸变、诱

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