Relation between the material of roof and the risk of lightning caused damage: The rolling sphere method in the use

Abstract

In the risk calculation connected to lightning protection, it is important to determine the expected average annual number of accidents caused by a lightning strike. There are different methods for that (the most popular ones are the Probability Modulated Attraction Space (PMAS) theory and the Dynamic Electro-Geometric Model (DEGM)). The paper aims to represent the correct use of the mesh method (regarding different articles and methods) in lightning protection compared to the results of the rolling sphere method.For an air-termination system, it is necessary to know not only the number of the possible lightning overall but to estimate the shielding failures as well. If there is much simplification, or some parameters or environmental factors will be inadequately neglected, that could cause incorrect risk determination.