Сравнительный анализ методов расчетной оценки количества ударов молнии в объект

Abstract

The results of the estimate of the expected number of lightning strikes in the construction of the hangar-type conducted in two ways: using the application "Likelihood", developed by the authors, and formulas "3H" of existing standards. The program is implemented electro geometrical method (EGM), which is the base for assessing the protection zone lightning rods. The calculations were performed taking into account the statistical distribution of the amplitudes of lightning currents in accordance with the parameters specified in the standard IEC 62305-1: 2010. Considered a range of the lightning current (2 - 200) kA, which corresponds to the I level lightning protection. The likelihood that the force of the lightning current exceeds 200 kA is not more than 1%. Formula "3H" used to assess "the area contraction" gives inflated several times (for the considered object 2.67 times) the result, because it does not take into account the real shape of the object and the statistical distribution of the lightning current, which determines the radius of the rolling sphere in EGM method.