梯级先导电场变化特征分析  

Analysis of Stepped Leade Electric Field Change Characteristics

作　　者：李海雷[1] 商鹏[1] 刘向科 孙荆茶[1] 

机构地区：[1]山东省雷电防护技术中心,山东济南250031

出　　处：《成都信息工程大学学报》2017年第5期498-502,共5页Journal of Chengdu University of Information Technology

基　　金：山东省自然科学基金资助项目(ZR2016DP04);山东省气象局青年科研基金资助项目(2016SDQN11)

摘　　要：利用快慢天线测量的济南地区的2015年7-8月的闪电快慢电场,共选取12次闪电首次回击前的梯级先导数据进行分析,先导平均持续时间为1689μs,先导脉冲时间宽度6.81μs。按照梯级先导波形的特征将梯级先导分为4类,持续时间分别为:915.4μs、241.95μs、8.2μs及5513.87μs;脉冲时间宽度分别为:17.13μs、4.53μs、1.02μs及3.79μs;脉冲极性与首次回击极性相同,前三类脉冲为单极性脉冲,第四类前期脉冲双极性(脉冲下降沿与回击相同),后期脉冲单极性;前两类先导脉冲有小脉冲叠加现象,后两类脉冲曲线光滑;负地闪先导持续时间504.03μs,脉冲时间宽度10.62μs,正地闪先导持续时间2874.63μs,脉冲时间宽度3.82μs。This text utilises the fast and slow lightning speed of antenna measurement by the electric field in Jinan area during July to August 2015,to analyze the stepped forerunner datas by a total of 12 times.The forerunner average duration is 1689 μs,the forerunner pulse time width is 6.81 pμs.It is divided into four categories according to the characteristics of the stepped waveform.The duration is 915.4 μs,241.95 μs,8.2 μs and 5513.87 μs;the pulse duration width is 17.13 μs,4.53 μs,1.02 μs and 3.79 μs.The pulse polarity is the same with the first return stroke polarity,the former three types pulse are unipolar pulse,and the earlier stage of the fourth pulse is bipolar （pulse declined is the same with return stroke）,the late pulse is unipolar.There is a small pulse superposition phenomenon with the first two types pilot pulse,and the curves of latter two types pulse are smooth.The pilot duration of minus earth lightning is 504.03 μs,and the pulse width is 10.62 μs,moreover,the pilot duration of the positive earth lightning is 2874.63 μs,and the pulse width is 3.82 μs.

关 键 词：快慢天线 闪电 梯级先导 快慢电场 电场特征 

分 类 号：TM937[电气工程—电力电子与电力传动]