Experimental Study on Branch and Diffuse Type of Streamers in Leader Restrike of Long Air Gap Discharge
Experimental Study on Branch and Diffuse Type of Streamers in Leader Restrike of Long Air Gap Discharge
复制标题
长气隙放电先导再起弧分支型和扩散型流注实验研究
DOI：
10.1088/1009-0630/18/3/15
复制
发表时间：
2016-03-01
影响因子：
1.7
通讯作者：
Ding Yujian
中科院分区：
文献类型：
--
作者：
Chen She;Zeng Rong;Ding Yujian
特高压输电工程的主要问题之一是外绝缘距离的选择，这需要对长气隙放电机理有深入的了解。引导流传播是长气隙放电中最重要的阶段之一。在导体塔晶格配置中，我们测量了高压侧的电压、电流和间隙中的电场。虽然先导流光系统中的流光呈现圆锥形或双曲面漫反射形状，但实验中首次通过高速摄像机观察到先导流光前面清晰的分支结构流光。此外，还发现分支型流注的先导速度、宽度和注入电荷均大于扩散型流注。我们认为这种现象是由高湿度造成的，在我们的实验中，湿度为 15.5-16.5 g/m(3)。
One of the main problems in the Ultra High Voltage (UHV) transmission project is to choose the external insulation distance, which requires a deep understanding of the long air gap discharge mechanism. The leader-streamer propagation is one of most important stages in long air gap discharge. In the conductor-tower lattice configuration, we have measured the voltage, the current on the high voltage side and the electric field in the gap. While the streamer in the leader-streamer system presented a conical or hyperboloid diffuse shape, the clear branch structure streamer in front of the leader was firstly observed by a high speed camera in the experiment. Besides, it is found that the leader velocity, width and injected charge for the branch type streamer are greater than those of a diffuse type. We propose that the phenomenon results from the high humidity, which was 15.5-16.5 g/m(3) in our experiment.