基于Kerr电光效应测量的液体空间电荷产生及其分布特性

发布时间：2018-01-13 19:26

本文关键词：基于Kerr电光效应测量的液体空间电荷产生及其分布特性　出处：《高电压技术》2014年01期 　论文类型：期刊论文

【摘要】：空间电荷是影响绝缘介质耐电强度,导致电场分布畸变和电介质击穿的重要参数之一。为了更深入地开展液体中空间电荷产生及其分布特性的试验及相关机理研究,采用基于Kerr效应的空间电荷高速CCD(charge-coupled device)测量系统,实现了碳酸丙烯酯中黄铜、不锈钢、铝3种电极材料在冲击电压下光强分布特性的测量;结合改进的图像处理技术,对极间电场随时间变化的动态发展过程进行反算;同时依据传统电击穿理论和双电层理论对空间电荷产生及发展的微观机理进行分析。研究表明:在不同材料以及不同电压极性下,空间电荷分布呈现出双极注入、正电荷注入及负电荷注入3种显著的注入特征,其中双极注入提高了液体电介质的冲击绝缘性能,正电荷注入和负电荷注入使得液体电介质绝缘性能降低,其注入特性的差异与外加电压大小、电极材料、电极表面状态等因素有关。
[Abstract]:Space charge is the influence of insulation dielectric electrical strength. One of the important parameters leading to the distortion of electric field distribution and dielectric breakdown, in order to carry out more in-depth research on the generation and distribution of space charges in liquids and related mechanisms. The measurement system of space charge high speed CCD(charge-coupled device based on Kerr effect was used to realize brass and stainless steel in propylene carbonate. Measurement of light intensity distribution characteristics of three kinds of aluminum electrode materials under impulse voltage; Combined with the improved image processing technology, the dynamic development process of the inter-pole electric field with time is inversely calculated. At the same time, the microcosmic mechanism of space charge generation and development is analyzed based on the traditional breakdown theory and double layer theory. The results show that: under different materials and different voltage polarity. The space charge distribution shows three obvious characteristics: bipolar injection, positive charge injection and negative charge injection, in which bipolar injection improves the shock insulation performance of liquid dielectric. The positive charge injection and negative charge injection make the insulating performance of liquid dielectric decrease. The difference of the injection characteristics is related to the applied voltage, electrode material, electrode surface state and so on.
【作者单位】：输配电装备及系统安全与新技术国家重点实验室;广州供电局;
【基金】：国家自然科学基金(51277190) 国家重点基础研究发展计划(973计划)(2009CB724504)~~
【分类号】：TM855.1
【正文快照】： 0引言1电场作用下液体电介质的空间电荷测量是电力设备内绝缘研究的热点问题[1-3],同时也是液体放电击穿机理和过电压防护研究的基础。自20世纪60年代以来,一种新型的Kerr电光效应法逐渐引入高压电场测量领域,该方法通过光学手段获取外加电场在双折射液体中形成的光波相位差

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