Identification of striking distance considering the velocity ratio and competition among the leaders |
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| Affiliation: | 1. Department of Mechanical and Aerospace Engineering, The State University of New York, Buffalo, NY 14260, USA;2. Department of Oral Diagnostic Sciences, The State University of New York, Buffalo, NY 14214, USA;1. University of Žilina, Faculty of Electrical Engineering, Univerzitná 1, 010 01 Žilina, Slovak Republic;2. Comenius University, Faculty of Mathematics, Physics and Informatics, Mlynská Dolina F2, 842 48 Bratislava, Slovak Republic;3. R&D Center for Low-Cost Plasma and Nanotechnology Surface Modification, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic;1. Departament d’Enginyeria Electrònica, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain;2. Departament d’Enginyeria Electrònica, Universitat Politècnica de Catalunya, 08034 Barcelona, Spain |
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| Abstract: | The striking distance is an important parameter to design a reliable lightning protection system. To protect an object against direct strikes, an improved leader progression model combined fractal geometry and the leader initiation criteria proposed by M. Becerra is introduced to determine the striking distance on a given structure. Both the deterministic and stochastic features of the lightning leader are considered and more detailed three-dimensional numerical simulation of the leader discharge is achieved due to the application of extended grid. Some of the basic methods and strategies are outlined and the influence on protection zone caused by leader velocity ratio is analyzed. Moreover, a comparative analysis of the results obtained through the improved model, the rolling sphere method and the Cooray model is performed. The results indicate that the presented method is closer to the natural lightning and the selection of the breakdown point is actually a complex competitive process among numerous upward leaders. |
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| Keywords: | Electric breakdown Leader velocity ratio Lightning protection Modeling Striking distance |
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