Abstract
Lightning electromagnetic field is obtained by using “engineering” models of lightning return strokes and new channel-base current functions and the results are presented in this paper. Experimentally measured channel-base currents are approximated not only with functions having two-peaked waveshapes but also with the one-peaked function so as usually used in the literature. These functions are simple to be applied in any “engineering” or electromagnetic model as well. For the three “engineering” models: transmission line model (without the peak current decay), transmission line model with linear decay, and transmission line model with exponential decay with height, the comparison of electric and magnetic field components at different distances from the lightning channel-base is presented in the case of a perfectly conducting ground. Different heights of lightning channels are also considered. These results enable analysis of advantages/shortages of the used return stroke models according to the electromagnetic field features to be achieved, as obtained by measurements.
Highlights
One of the key issues in research of environmental electromagnetic interference with electric systems, electronic devices and equipment inside imperfectly enclosed structures, so as with power and communication lines, is modeling of lightning discharges
Lightning electromagnetic field is obtained by using “engineering” models of lightning return strokes and new channel-base current functions and the results are presented in this paper
For the three “engineering” models: transmission line model, transmission line model with linear decay, and transmission line model with exponential decay with height, the comparison of electric and magnetic field components at different distances from the lightning channel-base is presented in the case of a perfectly conducting ground
Summary
One of the key issues in research of environmental electromagnetic interference with electric systems, electronic devices and equipment inside imperfectly enclosed structures, so as with power and communication lines, is modeling of lightning discharges. “Engineering” models use simplified approach with respect to the current distribution along the lightning channel, but electromagnetic field is determined based on the same relations as for electromagnetic models All these models enable approximate analysis of lightning electromagnetic field and its coupling to systems or devices, due to a wide variety of conditions accompanying this natural phenomenon. Many researchers are focused on comparison of different “engineering” models using the same channel-base current, but the influence of an implied current waveshape itself on lightning electric and magnetic field components is not investigated, as to the author’s best knowledge. A review of new functions is given in [16] for representing IEC 62305 standard currents [17] and other typical lightning stroke currents These functions are suitable for use in both “engineering” and antenna theory models [18] to approximate the excitation at the channel base
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