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Mathematical Problems in Engineering
Volume 2014, Article ID 925463, 10 pages
http://dx.doi.org/10.1155/2014/925463
Research Article

An Algorithm for Evaluation of Lightning Electromagnetic Fields at Different Distances with respect to Lightning Channel

1Centre for Electromagnetic and Lightning Protection Research (CELP), Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia
2Islamic Azad University, Firoozkooh Branch, Iran
3Aryaphase Company, Tehran, Iran

Received 9 September 2014; Accepted 23 October 2014; Published 12 November 2014

Academic Editor: Chien-Yu Lu

Copyright © 2014 Mahdi Izadi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The analytical field expressions are proposed to estimate the electromagnetic fields associated with vertical lightning channel at an observation point directly in the time domain using current and geometrical parameters. The proposed expressions embrace a large number of channel base current functions and widely used engineering current models. Moreover, they can be joined with different coupling models for evaluation of lightning induced voltage when they provide different required field components directly in the time domain. The data from measured fields and simulated fields from previous works were employed to validate the proposed field expressions. The simulated results were compatible with both computed field values from previous studies and the measured fields.