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Electrical parameter such as conductivity and permittivity of the ground are varies depends on terrain conditions. These parameters can affects lightning electromagnetic fields (LEMFs) observed at particular point from the striking location. In this study, the results of LEMFs in the presence of vertically stratified ground arereported. Lightning return stroke channel current is modeled using the...
In this paper, a new approach has been presented for evaluation of the impulse circuit parameters from known physical parameters (rise or peak time and tail time) using Nelder-Mead algorithm (NMA). Results of second order impulse circuit parameters such as C1, C2, R1, and R2 are reported for generating lightning impulse (LI) and switching impulse (SI) as given in standards (IEEE 4-2013 and IEC 60060-1)...
A genetic algorithm (GA) is applied to calculate the lightning current parameters of the channel-base current function. Heidler’s function parameters for subsequent return stroke are tuned for a typical value of ( 12 kA) for different and also for a typical value of ( 40 kA/s) for different values of , using a GA as the tool. This is...
Lightning generated horizontal electric field above the ground have been computed and reported for a typical height of 10 m (above the ground plane), at a radial distance of 750 m from the striking point. The results are presented for typical first and subsequent return strokes of lightning involving two cases, (i) perfectly conducting ground (ii) finitely conducting ground (σg=0.0001 S/m). The ground...
This paper presents the computed results of electric and magnetic fields generated by the near by lightning. The electric and magnetic fields have been computed for different heights ranging from 10 m to 2 km above the ground and for the lateral distances varying from 20 m to 2 km from the lightning return stroke. For airborne vehicles e.g. satellite launch vehicles, missiles etc, it has become necessary...
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