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Investigations on Voltages and Currents in Lightning Protection Schemes Involving Single Tower

Kumar, Udaya and Nayak, Paresh Kumar (2005) Investigations on Voltages and Currents in Lightning Protection Schemes Involving Single Tower. In: IEEE Transactions on Electromagnetic Compatibility, 47 (3). pp. 543-551.

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Abstract

A reliable protection against natural lightning has become very essential for modern critical systems. For very vulnerable systems, the protection system is physically isolated from them. In such cases, towers taller than system being protected are generally employed. The maximum allowable bypass current and the so-called rise in potential during the strike decide the height and location of such towers. For tall towers, TM modes dominate at least during the rising portion of the current making the analysis very complicated. In view of this, for a better assessment of the potential at the top and the base currents, experimental investigation in the frequency domain is carried out on the electromagnetically scaled model of the actual tower. The possible reduction in the tower base currents with the connection of ground wires and the influence of neighboring structures on the tower surge response are also studied. Investigations are also carried out on an alternative design involving mast insulated from the supporting tower and a separate set of ground wires acting as down conductors. Some analysis on the electric withstand capabilities of the insulating support is also made. The findings of the present work are believed to be quite useful to lightning protection engineering.

Item Type: Journal Article
Additional Information: Copyright 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.
Keywords: Insulated mast design;Lightning protection;Tower surge impedance;Tower with ground wires
Department/Centre: Division of Electrical Sciences > High Voltage Engineering (merged with EE)
Date Deposited: 25 Aug 2008
Last Modified: 19 Sep 2010 04:34
URI: http://eprints.iisc.ernet.in/id/eprint/9609

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