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

空间电荷对雷击先导过程影响的研究

• 批准号: 14550262
• 负责人: TAKAGI Nobuyuki
• 金额: $ 2.3万
• 依托单位: Gifu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14550262/
• 关键词: space charge density; thundercloud; sound wave; lightning protection; real time sensing

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.

在本研究中，我们的最终目标是明确避雷罩失效与输电线塔周围空间电荷之间的关系。为了实现这一目标，我们做了三项研究，1.使用声波的新型超灵敏系统进行空间电荷测量，2.风对针电晕放电电流的影响，3.向上闪电先导击中的高速视频。研究1.我们估计了水蒸气中带电的空间电荷的位置和密度，误差分别为1%至14%、10%和77%。雷雨云下安装在14.5m高的管道上的针上的电荷密度约为100nC/m3。在研究2.中，我们发现针的电晕放电电流随着风速的增加而增加，但随着风速的增加而减少当迎风处有另一针时。在研究3中，向上先导行程的速度随着高度的增加而增加。并且一些小放电发生与先导冲程相关。从以上结果，我们得出结论，空间电荷对冬季雷云下高塔先导冲程的启动和进展有影响。

项目成果

Initiation and propagation characteristics of upward positive leaders

向上积极领导者的启动和传播特征

• 发表时间: 2004
• 期刊: Proceedings of EMC04, Sendai
• 作者: D.Wang;N.Takagi;T.Watanabe
• 通讯作者: T.Watanabe

Initiation and propagation characteristics of upward positive leader

向上积极领导者的启动和传播特征

• 发表时间: 2004
• 期刊: Proceedings of EMG04,Sendai
• 作者: D.Wang;N.Takagi;T.Watanabe
• 通讯作者: T.Watanabe

D.Wang, N.Takagi, X.Liu, T.Watanabe, A.Chihara: "Luminosity characteristics of multiple dart leader/return stroke sequences measured with a high-speed digital image system"Geophysical Research Letters. (in press). (2004)

D.Wang、N.Takagi、X.Liu、T.Watanabe、A.Chihara：“用高速数字图像系统测量的多个飞镖前导/回程序列的光度特性”地球物理研究快报。

Development of space charge sensing system

空间电荷传感系统的开发

• 发表时间: 2003
• 期刊: Proceedings of 12th International Conference on Atmospheric Electricity, Versailles, France vol.1
• 作者: N.Takagi;D.Wang;T.Watanabe;K.Yamaguchi;M.Kobori
• 通讯作者: M.Kobori