Studies on characteristics of lightning generated currents in an interconnected lightning protection system

Hegde, Vishwanath and Kumar, Udaya (2009) Studies on characteristics of lightning generated currents in an interconnected lightning protection system. In: Journal of Electrostatics, 67 (4). pp. 590-596.

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Abstract

An in-depth knowledge about the characteristics of lightning generated currents will facilitate evaluation of the interception efficacy of lightning protection systems. In addition, it would aid in extraction of valuable statistics (from measured current data) on local lightning parameters. Incidentally, present day knowledge on characteristics of lightning induced current in typical lightning protection systems is rather limited. This is particularly true with closely interconnected protection systems, like the one employed in Indian Satellite Launch Pad-II. This system is taken as a specific example in the present study. Various aspects suggest that theoretical modelling would be the best possible approach for the intended work. From the survey of pertinent literature, it is concluded that electromagnetic modelling of lightning return-stroke with current source at the channel base is best suited for this study. Numerical electromagnetic code was used for the required electromagnetic field solution and Fourier transform techniques were employed for computing time-domain results. A validation for the numerical modelling is provided by laborator experiments on a reduced scale model of the system. Apart from ascertaining the influence of various parameters, salient characteristics of tower base currents for different kinds of events are deduced. This knowledge can be used in identifying the type of event, as well as its approximate location. A method for estimation of injected stroke current has also been proposed.

Item Type:	Journal Article
Publication:	Journal of Electrostatics
Publisher:	Elsevier Science
Additional Information:	copyright of this article belongs to Elsevier Science.
Keywords:	Lightning;Lightning protection system;Intercepted strokes; Lightning generated currents;Stroke classification; Incident stroke current
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	15 Dec 2009 08:59
Last Modified:	19 Sep 2010 05:38
URI:	http://eprints.iisc.ac.in/id/eprint/21648

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