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Effect of Transient Impedance of a Lossy Ground on Horizontal Electromagnetic Field Due to Inclined Lightning Strokes


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Abstract


Evaluating the electromagnetic fields very close to lightning strokes has been widely studied. The electromagnetic fields generated by the lightning are strongly affected by the inclination of the channel and the ground impedance. For the inclined channel particularly the very near fields, the literature show poor approach for such problems. While the vertical electric field is less affected by ground effects, the horizontal field is strongly affected, varying from zero at the ground to a negative value. In this paper, the effect of ground is taken into account in the calculation process of the amplitude of the electromagnetic fields in the early instants of the stroke. Using a simple method for calculating the magnetic field by considering the lightning stroke as an infinitely long filament, the electric field is then calculated by simply discretising the Ampere’s law. The results show that the channel inclination and the ground impedance affect markedly the fields at close distances.
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Keywords


Lightning Stroke; Electromagnetic Fields; Channel Inclination; Ground Impedance

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References


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