摘要
为了分析雷电电磁脉冲在网线上耦合感应过电压的特征,通过观测人工触发闪电和自然闪电时100m架空网线上感应过电压的方法,对其特征进行分析。试验期间共采集3次人工触发闪电和15次自然闪电条件下的数据。分析结果表明:(1)近距离触发闪电时,网线上的感应过电压峰值较大,3次触发闪电平均过电压峰值约4.7kV;(2)自然闪电引起的网线过电压峰值能达到几百伏,28次回击正负过电压平均值都为120V左右;(3)通过研究有闪电定位资料的自然闪电发现,引起的过电压变化和对应回击电流与距离的比值(I/d)的线性拟合度较好,相关系数达到0.801,但影响网线感应过电压大小的因素较多,所以并不完全是线性关系;(4)由于近距离闪电静电场、感应场和辐射场的共同作用,近距离闪电引起的网线过电压波形相对比较复杂,持续时间也相对较长。
In this paper, we conducted an observation experiment to analyze the characteristics of the coupling induction overvoltage on a 100m overhead network cable under the lightning electromagnetic pulse（LEMP）introduced by artificially triggered lightning and natural lightning. The induced overvoltage data for 100m overhead network cable under the condition of 3 times of triggered lightning and 15 times of natural lightning were collected during the test. The main conclusion are obtained by the observation data and given as follow： （1） the peak value of induction overvoltage in the condition of nearby artificially triggered lightning is higher and the average overvoltage peak value of three records under artificially triggered lightning is about 4.7 KV; （2）The overvoltage peak values under natural lightning are on the orders of hundred volts. The average overvoltage peak values of 28records produced by return strokes is about 120 V; （3） The related linear regression coefficient between the change of the resulted overvoltage and the corresponding return stroke electric current and distance ratio （I/d） is high （0. 801 ） through the analysis of lightning location date. But it is not a totally linear relation as there are many factors that have effect on the induction overvoltage; （4） The overvoltage waveform on the network cable introduced by nearby lightning is relatively more complicated and lasts longer due to the combined action of electrostatic field, induction field and radiation field.
出处
《成都信息工程学院学报》
2013年第2期187-192,共6页
Journal of Chengdu University of Information Technology
基金
公益性行业(气象)科研专项经费资助项目(GYHY201006005)
关键词
架空网线
感应过电压
自然闪电
人工触发闪电
雷电电磁脉冲
overhead network cable
induction overvoltage
natural lightning
artificially triggered lightning
lightning electromagnetic pulse（LEMP）
