操作冲击下空间电荷对间隙放电的影响
发布时间：2019-05-09 07:53
【摘要】：绕击是造成超特高压输电线路雷击跳闸的主要原因,很多学者认为空间电荷是造成绕击事故的原因之一。为深入研究空间电荷对雷电放电的影响,本文搭建了100cm板-针间隙,对其施加正、负极性操作冲击电压,采用高速摄像系统对放电发展过程进行观测。为定量分析空间电荷对放电发展的影响,测量了正板-针间隙预放电电流,通过提取电荷电流,并对其积分得到空间电荷量的大小。试验结果发现:正、负极性操作电压下,放电发展都是由正极性电极指向负极性电极;正极性操作冲击电压下,放电击中点在针电极头部的概率随着针头部曲率半径的增大而增大。在相同的试验条件下,板-尖头针间隙的空间电荷量最大,随着针电极头部曲率半径逐渐增大,空间电荷量逐渐变小。
[Abstract]:Bypass is the main cause of lightning tripping in ultra-high voltage transmission lines. Many scholars believe that space charge is one of the causes of bypass accidents. In order to study the effect of space charge on lightning discharge, a 100 cm plate-needle gap was set up in this paper, and the impulse voltage was applied to it with positive and negative polarity operation. A high-speed camera system was used to observe the discharge development process. In order to quantitatively analyze the effect of space charge on the development of discharge, the pre-discharge current between positive plate and needle was measured. The charge current was extracted and the amount of space charge was obtained by integrating it. The results show that: under the positive and negative operating voltage, the discharge development is directed from the positive electrode to the negative electrode; Under the positive polarity operating impulse voltage, the probability of the discharge hitting point at the tip of the needle electrode increases with the increase of the radius of curvature of the needle head. Under the same test conditions, the space charge of the plate-needle gap is the largest, and the space charge becomes smaller with the increase of the curvature radius of the needle electrode head.
【作者单位】： 华北电力大学高电压与电磁兼容北京市重点实验室;华北电力大学新能源电力系统国家重点实验室;国家电网公司交流建设分公司;莱芜供电公司;城市建设研究院;
【分类号】：TM83
[Abstract]:Bypass is the main cause of lightning tripping in ultra-high voltage transmission lines. Many scholars believe that space charge is one of the causes of bypass accidents. In order to study the effect of space charge on lightning discharge, a 100 cm plate-needle gap was set up in this paper, and the impulse voltage was applied to it with positive and negative polarity operation. A high-speed camera system was used to observe the discharge development process. In order to quantitatively analyze the effect of space charge on the development of discharge, the pre-discharge current between positive plate and needle was measured. The charge current was extracted and the amount of space charge was obtained by integrating it. The results show that: under the positive and negative operating voltage, the discharge development is directed from the positive electrode to the negative electrode; Under the positive polarity operating impulse voltage, the probability of the discharge hitting point at the tip of the needle electrode increases with the increase of the radius of curvature of the needle head. Under the same test conditions, the space charge of the plate-needle gap is the largest, and the space charge becomes smaller with the increase of the curvature radius of the needle electrode head.
【作者单位】： 华北电力大学高电压与电磁兼容北京市重点实验室;华北电力大学新能源电力系统国家重点实验室;国家电网公司交流建设分公司;莱芜供电公司;城市建设研究院;
【分类号】：TM83
【参考文献】
相关期刊论文 前9条
1 廖蔚明;崔国华;孙昭英;李成榕;;±800kV直流线路杆塔塔头空气间隙的直流叠加操作冲击放电特性[J];电网技术;2008年09期
2 曾嵘;耿屹楠;牛r，
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