Preliminary Studies on the Characteristics of the Induced Currents in Simple Down Conductors Due to a Nearby Lightning Strike

Kumar, Udaya and Hegde, Vishwanath and Shivanand, Vinoda (2006) Preliminary Studies on the Characteristics of the Induced Currents in Simple Down Conductors Due to a Nearby Lightning Strike. In: IEEE Transactions on Electromagnetic Compatibility, 48 (4). pp. 805-816.

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Abstract

A lightning strike in a neighborhood can induce significant currents in tall down conductors. Although the magnitude of current in this case is much smaller than that encountered during a direct strike, the probability of occurrence and the frequency content is higher. In view of this, appropriate knowledge of the characteristics of such induced currents is relevant for the scrutinization of the recorded currents. Considering these, the present paper makes a preliminary investigation into the basic characteristics of lightning-induced currents in simple tall vertical down conductors. The electromagnetic model is employed for the study, and NEC-2 is employed for the numerical field computations. Laboratory experiments with reduced-scale electromagnetic model of the system are employed to validate the numerical approach. The influence of important parameters has been investigated and highly insightful results obtained. The induced current is found to depend on the maximum rate of rise of the stroke current and its velocity of propagation, the height of the down conductor, and the footing impedance. The channel inclination and the distance between the channel and the down conductor have significant influence on the magnitude of the induced current. It is found that the radius of the down conductor is not very influential. The induced current due to a stroke on a nearby conducting object of considerable height can have different overall features

Item Type:	Journal Article
Publication:	IEEE Transactions on Electromagnetic Compatibility
Publisher:	IEEE
Additional Information:	©2006 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.
Department/Centre:	Division of Electrical Sciences > High Voltage Engineering (merged with EE)
Date Deposited:	28 May 2008
Last Modified:	19 Sep 2010 04:45
URI:	http://eprints.iisc.ac.in/id/eprint/14061

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