Study of the influence of space charge on lightning leader stroke progress

在本研究中，我们的最终目标是明确电力线塔周围空间电荷与防雷罩失效之间的关系。为了达到这个目的，我们做了三个方面的研究：1。利用声波测量空间电荷的新型超灵敏系统，2。2 .风对针状电晕放电电流的影响。高速视频向上闪电领袖中风。在研究中1。，对水蒸气中空间电荷的位置和密度的估计误差分别为1% ~ 14%和10% ~ 77%。雷云下14.5m高管道上的针上电荷密度约为100nC/m3。在书房里。结果表明，当风方向有另一根针时，针的电晕放电电流随风速增大而减小；在书房3。，向上先导冲程的速度随高度增加而增加。一些小的放电与领导的进步有关。从以上结果可以看出，空间电荷对冬季雷雨云下高塔先导冲程的起始和发展有一定的影响。

In this study, our final goal is to make clear the relationship between the failure of lightning shield and the space charge around power line towers. To succeed this purpose, we have done three studies, 1.space charge measurement by new supersensitive system using sound wave, 2.effect of wind on the corona discharge current from a needle, 3.high speed video of upward lightning leader stroke.In the study 1., we estimated the position and the density of the space charge charged in water vapor with errors of 1% to 14% and 10% and 77%, respectively. The charge density over needles mounted on a pipe with 14.5m high under thundercloud is about 100nC/m3.In the study 2., we found out that the corona discharge current from a needle increases with the wind speed, but decreases with the wind speed when there is an another needle in the windward.In the study 3., the speed of the upward leader stroke increases with height. And some small discharges occur associated with leader progress.From above the results, we concluded that the space charge have influences on the initiation and the progress of leader stroke from a tall tower under winter thundercloud.