The final part of the article "How to choose lightning rods after all?"
The statistical method for the design of external lightning protection of buildings of different height, large massifs of industrial construction, power lines of voltage upscales, has been actively used by the national practice for more than 30 years. The typical protection zones of single and double rod and catenary wire lightning rods, included into the existing regulatory documents on lightning protection of the Russian Federation are calculated on its base. In its generalized form in 2009, the method was recommended for use by the Technical memo № 25/09 of Roselektromontazh association, approved by Gostechnadzor . Formally, the statistical method is applicable for the choice of lightning rods with any somewhat high reliablity, but its source data cannot be considered well proved by the use experience on the level higher than 0,999. For this reason, the calculation data about a higher reliability of protection should be studied as approximate. The ways to improve the method are obvious, but they cannot be implemented without accumulation of the necessary use experience. To be fair it should be noticed that the reliability of external lightning protection, exceeding 0,999 is not so in demand. In fact, at the height of the lightning rod of about 1 m, as mentioned above, it will take about 1 lightning striker per year upon itself, which will bring to one breakthrough in 1000 years of use at the indicated reliability. It is not so bad in comparison to other natural disasters.
The question about the practicability of the analysis given in this article afer a many-year practical application of statistical principles is legible. Its answer should be negative, if not the persistent efforts to introduce EIC standard prescriptions in Russia. The compliers of this European document do not reveal the scientific bases and the quantitative reason of the calculation methods of choosing lightning rods offered in it.
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E. M. Bazelyan, DEA, professor
Energy Institute named after G.M. Krzyzanowski, Moscow
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