复合绝缘子污闪局部电弧微观发展及影响因素研究

发布时间：2018-01-08 09:09

本文关键词：复合绝缘子污闪局部电弧微观发展及影响因素研究　出处：《沈阳工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：复合绝缘子因其重量轻、耐污闪性能优越在电力传输中得到广泛应用。但在高海拔地区和环境严重污染地带,复合绝缘子表面也易积污形成导电污层,泄漏电流热效应使其表面形成干区发生沿面放电或产生局部电弧,局部电弧的发展至闪络会造成电网电力系统事故。因此对复合绝缘子污闪局部电弧的形成及其发展的研究具有重要意义。本文以FZSW-10/4型号支柱复合绝缘子为研究对象,基于等值盐密法对绝缘子进行人工污秽试验,测量了起晕电压和闪络电压,并拍摄了局部电弧形成至完全闪络的全过程,作为宏观仿真初始条件。建立了绝缘子表面干区和剩余污层串联的二维电场仿真模型,对比分析了绝缘子表面不同污秽分布状况、不同污层盐密电导率对复合绝缘子局部电位、电场分布的影响,作为微观仿真模型的初始条件。依据试验观察到的局部电弧的产生位置及宏观电场、电位的仿真结果,基于奥本斯诺污闪放电模型,及Boltzmann电子飘逸扩散方程、Maxwell-Stefan重物质输运方程和泊松方程建立了污闪局部电弧微观仿真模型,考虑了电子碰撞电离、激发、弹性碰撞、吸附、中性粒子间碰撞等43种反应方程,从微观粒子运动的角度揭示局部电弧的形成机理,并对比分析了污层盐密、干区温度、干区长度、干区初始电子密度等因素对污闪局部电弧微观参数的影响。研究结果给出了FZSW-10/4型号复合绝缘子的起晕电压、闪络电压与等值盐密满足的幂函数规律及局部电弧的产生位置;伞裙表面不同污秽分布状况、污层电导率对局部电场、电位的影响;污层盐密、干区温度、干区长度与局部电弧鞘层场强及弧柱区微观参数的关系。为复合绝缘子污闪局部电弧的微观发展提供了理论依据。
[Abstract]:Composite insulators are widely used in electric power transmission because of their light weight and excellent flashover resistance. However, in high-altitude areas and seriously polluted areas, the surface of composite insulators is prone to fouling to form a conductive layer. The thermal effect of leakage current results in the formation of surface discharge or partial arc in the dry area of the surface. The development of local arc to flashover will result in power system accident. Therefore, it is of great significance to study the formation and development of local arc of composite insulator pollution flashover. In this paper, the FZSW-10/4 model pillar is used for the study of the formation and development of local arc. The insulator is the object of study. Based on the method of equivalent salt density, the artificial contamination test of insulator was carried out. The corona initiation voltage and flashover voltage were measured, and the whole process of local arc forming to full flashover was photographed. As the initial condition of macroscopical simulation, a two-dimensional electric field simulation model of the dry zone of insulator surface and the series of residual pollution layer is established, and the distribution of different contamination on insulator surface is compared and analyzed. The influence of different salt density conductivity on local potential and electric field distribution of composite insulator is taken as the initial condition of microscopic simulation model. The location of local arc and the macroscopic electric field are observed according to the experimental results. The simulation results of the potential are based on the Auburn Snow flashover model and the Boltzmann electron transport diffusion equation. The microscopic simulation model of local arc in pollution flashover is established by Maxwell-Stefan heavy matter transport equation and Poisson equation. The electron collision ionization, excitation, elastic collision and adsorption are considered. The formation mechanism of local arc is revealed from the point of view of the motion of microparticles, and the salt density, dry zone temperature and dry zone length are compared and analyzed. The effect of the initial electron density of dry zone on the microcosmic parameters of local arc in pollution flashover is studied. The corona initiation voltage of FZSW-10/4 composite insulator is given. The law of power function of flashover voltage and equivalent salt density and the location of local arc; Different contamination distribution on the surface of umbrella skirt, and the influence of fouling layer conductivity on local electric field and potential; The relationship between salt density, dry zone temperature, dry zone length and local arc sheath field strength and microcosmic parameters of arc column region provides a theoretical basis for the micro development of local arc flashover of composite insulator.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM216

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