组合空气间隙放电路径选择性试验

发布时间：2018-07-13 07:59

【摘要】：为了研究空气间隙放电路径发展的分散性和随机性,分别对棒棒间隙、棒双棒组合间隙击穿特性,放电路径选择特性及放电路径发展随机特性开展研究。试验中考虑了下棒电极头部形状和下棒电极布置方式的影响,并通过静电场仿真计算分析间隙电场不均匀系数对50%放电电压的影响,以及下棒电极头部周围静电场强度对放电路径选择特性的影响;同时采用图像处理技术计算了电极表面放电初始发展角θ,以表征高压棒电极表面放电发展随机特性。试验和仿真结果表明:间隙距离为0.4~1.2 m时,间隙电场不均匀系数越大,间隙50%放电电压越低。间隙距离相同情况下,下棒电极头部曲率越大,头部周围场强越大,越容易产生迎面流注,则被击中的概率越大;间隙距离对放电路径选择性有影响,下棒电极头部形状相同的情况下,间隙距离越小,该间隙下棒电极头部周围电场强度越大,越容易产生上行流注,则被击中的概率越大。空气间隙距离增大会减少下棒电极对高压棒电极放电初始发展方向的约束力,高压棒电极头部表面下行流注的发展方向随机性增强。
[Abstract]:In order to study the dispersion and randomness of the development of air gap discharge path, the characteristics of the gap between the rod and the rod, the breakdown characteristics of the combined gap, the characteristics of the discharge path selection and the random characteristics of the development of the discharge path are studied respectively. The influence of the shape of the lower rod electrode head and the arrangement of the lower rod electrode is considered in the experiment. The influence of the gap electric field nonuniformity coefficient on the discharge voltage of 50% is analyzed by electrostatic field simulation. The influence of the electrostatic field intensity around the electrode head on the characteristics of discharge path selection is also discussed, and the initial developing angle 胃 of electrode surface is calculated by image processing technique to characterize the random characteristics of discharge development on the surface of high voltage rod electrode. The experimental and simulation results show that the larger the gap electric field nonuniformity coefficient is, the lower the gap 50% discharge voltage is when the gap distance is 0.4 ~ 1.2 m. When the gap distance is the same, the bigger the curvature of the head of the lower rod electrode, the greater the field strength around the head, and the more likely it is to produce headstream, the higher the probability of being hit, the more the gap distance has an effect on the selectivity of discharge path. The smaller the gap distance is, the greater the electric field intensity around the head of the rod electrode is, and the higher the upward flow is, the higher the probability of being hit is. The increase of air gap distance will reduce the binding force of the lower rod electrode on the initial development direction of the high voltage rod electrode discharge, and the development direction of the downward flow on the head surface of the high voltage rod electrode will be enhanced.
【作者单位】：武汉大学电气工程学院;山东理工大学电气工程学院;广东电力科学研究院;
【基金】：中国博士后科学基金项目(2014M560624)~~
【分类号】：TM863

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