Estimating the channel base current in thetriggered-lightning experiment
One of the topics concerning electromagnetic compatibility of modern electronic systems is the efficient and economic protection against transients caused by direct or nearby lightning strikes. For the treatment of such problems, detailed information about lightning current and lightning electromagnetic pulse waveforms are necessary. For the measuring of channel base lightning current, although it can be obtained at instrumented towers or through rocket and wire technique, there are still some occasions that it couldn’t be measured directly. While the channel base lightning current is an important parameter that from which we can deduce some other parameters such as electromagnetic fields and the current and charge distribution along the lightning channel, there should be some other method to gain the knowledge of channel base lightning current. Estimating the current at the base of lightning channel from measurements of the electromagnetic fields is an important practical problem. This work has been done by some researchers. But their calculations are based only on the measurements of remotely electric and magnetic fields. None of them use the electromagnetic fields at close range from the lightning channel which can be easily measured in triggered-lightning experiments. Based on the calculations and measurements, the author of this paper finds some comparability between the measured close magnetic field and the channel base current. Then the transformer function idea is put out to obtain the channel base current from the closely measured magnetic fields in triggered lightning experiments. The results obtained in this study have important implications in electromagnetic compatibility.
Heming Ren Bihua Z hou
EMP Laboratory of Nanjing Engineering Institute, Nanj ing 210007, China, rhm0412@126.com
国际会议
第13届国际大气电学会议(The 13th International Conference on Atmospheric Electricity)
北京
英文
2007-08-13（万方平台首次上网日期，不代表论文的发表时间）