Vulnerability of Concentrated Above-Ground Structures to Lightning Strokes
Abstract
An analysis of existing methods for evaluating the vulnerability of concentrated above-ground structures to lightning strokes is given. It is pointed out that the vulnerability evaluation methods based on the protection angle and rolling sphere techniques recommended in IEC 62305 regulatory documents are rather formalized and devoid of physical essence. It is also shown that attempts to apply these methods yield results that contradict the data of field observations and cannot serve as a reliable basis for addressing practical lightning protection matters. In addition, the air-termination rod height is limited in these documents to 60 m, which does not make it possible to evaluate the vulnerability of ultra-high structures. An alternative approach implies the use of a probabilistic calculation method based on the physics of discharge in atmospheric air, the statistical nature of the process through which lightning orients on the system of structures, and the choice of an element within the system. This method has found its practical application in the relevant Russian regulations. To quantify the results of laboratory studies, an analysis scheme for the moment at which the downward leader head orients to a grounded concentrated object is considered. It is shown that when testing with impulse voltages with a front duration of several ms, the test results can serve as a good basis for transferring them to natural lightning. A simplified method is proposed for assessing the incidence of downward and upward lightning discharges on concentrated above-ground structures, the results of calculation by which are in good agreement with field observations.
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