摘要
为提高雷电监测的定位和幅值估算的精度,实现对雷电本体的遥测,研究了雷电辐射磁场沿混合路径土壤传播的规律。给出了单层土壤、两层土壤、三层土壤和任意土壤构成的混合路径上方的雷电辐射磁场频域计算公式,进而得出了混合路径情况下雷电辐射磁场的时域计算方法。分别以两层土壤和三层土壤构成的混合路径为基础分析了土壤电导率对雷电辐射磁场的影响,得出其影响主要体现在雷电辐射磁场的上升时间的变化上。通过分析任意土壤构成的混合路径情况下衰减函数计算结果的正确性,建议对于此类模型全部采用基于Millington经验公式的简单方法进行分析。最后总结了考虑混合路径情况下依据雷电磁场观测波形反演雷电流本体的方法。
For improving the positioning and amplitude estimation accuracy of lightning detection,so as to realize the telemetry of lightning,we studied the law of lightning radiated magnetic field propagation along the mixed path soil,put forward the frequency-domain method to calculate the lightning radiation magnetic field above single-layer,double-layer,three-layer,as well as mixed path with arbitrary constitution soil,and obtained the time-domain calculation formula for lightning radiation magnetic field.Taking the double-layer and three-layer mixed path as example respectively,we investigated the effect of soil conductivity on lightning radiation magnetic field.The result indicates that the contribution of the soil is mainly embodied in the rise time of the lightning magnetic field.Based on the accuracy evaluation of the attenuation function for mixed path with arbitrary constitution,the simple method on the basis of Millington formula is recommended for the soil model of these types.Moreover,the inversion method of lightning current from observed lightning magnetic field waveform with consideration of mixed path is summarized.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2010年第9期2291-2296,共6页
High Voltage Engineering
基金
国家自然科学基金(60601013)
国家电网公司"十一五"科技项目(SGKJ[2007]756)~~
关键词
雷电
回击
辐射磁场
多层土壤
混合路径土壤
土壤电导率
反演
频域
lightning
return stroke
radiated magnetic
multilayer soil
mixed path soil
soil resisitivity
invert
frequency domain
