Modeling of Return-Stroke Current Evolution over a Realistic Ground

Pal, R and Kumar, U (2021) Modeling of Return-Stroke Current Evolution over a Realistic Ground. In: IEEE Transactions on Electromagnetic Compatibility, 63 (5). pp. 1471-1479.

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Abstract

The return-stroke phase of the cloud-to-ground lightning flash is of primary concern for lightning-protection engineering. This also holds for buried cables and other sensitive devices in the soil. For evaluating the field in the soil, two approaches are employed: first, the quasi-static approach, in which a current source injects the stroke current into the soil; and second, a hybrid approach employing the 'engineering model' for the channel-current evolution. In both the approches, the current injected into the soil is independent of the soil resistivity, which needs further scrutiny. The return-stroke model developed by Balaram Raysaha et al. (2011) self-consistently emulates the stroke-current evolution without any such assumptions and is, therefore, very suitable for a comprehensive assessment of the situation. However, the field-computation method employed by Balaram Raysaha et al. had to be changed to the domain-based finite-difference time-domain method for a realistic soil model. After this augmentation, the return-stroke model is employed to investigate the possible role of soil's electrical parameters on the return-stroke current evolution. It is found that for fast-rising currents of low amplitudes, the soil resistivity noticeably influences the current amplitude. Also, it is found that the soil dispersion leads to a significantly lower electric field in the soil.

Item Type:	Journal Article
Publication:	IEEE Transactions on Electromagnetic Compatibility
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Clouds; Electric towers; Finite difference time domain method; Lightning protection; Time domain analysis, Cloud-to-ground lightning flash; Comprehensive assessment; Current amplitude; Electrical parameter; Engineering modeling; Return stroke current; Return stroke model; Sensitive devices, Soils
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	26 Nov 2023 09:39
Last Modified:	26 Nov 2023 09:39
URI:	https://eprints.iisc.ac.in/id/eprint/82934

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