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Analysis for the Reflected Waves Transmitted on to the Channel by Tall Grounded Objects Using a Special Case

Raysaha, Rosy Balaram and Kumar, Udaya and Cooray, Vernon (2012) Analysis for the Reflected Waves Transmitted on to the Channel by Tall Grounded Objects Using a Special Case. In: IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY, 54 (2). pp. 262-271.

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Official URL: http://dx.doi.org/10.1109/TEMC.2011.2161316

Abstract

During lightning strike to a tall grounded object (TGO), reflected current waves from TGO are transmitted on to the channel. With regard to these transmitted waves, there seems to be some uncertainties like: 1) will they get reflected at the main wavefront; and 2) if so, what would be their final status. This study makes an attempt to address these issues considering a special case of strike to a TGO involving equal channel core and TGO radii. A macroscopic physical model for the lightning return stroke is adopted for the intended work. Analysis showed that the waves transmitted on to the channel merges with the main wavefront without any sign of reflection. Investigation revealed that: 1) the nonlinear spatio-temporal resistance profile of the channel at the wavefront is mainly responsible for the same; and 2) the distributed source provides additional support. The earlier findings are not limited to the special case of TGO considered. In spite of considering equal TGO and channel core radii, salient features of the model predicted remote electromagnetic fields agree well with the measured data reported in literature.

Item Type: Journal Article
Additional Information: Copyright 2012 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: Corona sheath;lightning strike to tall grounded object (TGO);nonlinear spatio-temporal resistance profile; reflection of ascending waves at main wavefront
Department/Centre: Division of Electrical Sciences > High Voltage Engineering (merged with EE)
Date Deposited: 13 Aug 2012 10:26
Last Modified: 13 Aug 2012 10:29
URI: http://eprints.iisc.ernet.in/id/eprint/44484

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