Analysis Of Electromagnetic Properties In Different Media And Lightning Protection Design

Thunder and lightning electromagnetic pulse produced by the affected area is very broad, for the realization of the lightning protection, lightning deal with complex environment the propagation law of radiation field for research. In this paper, we study the earth’s surface, the mountain and buildings affect the spread of the radiation field of the thunder and lightning, and lightning protection scheme is put forward with the combination of three kinds of lightning arrester model, and applies it to the actual engineering cases.First, single layer beneath the soil is deduced CLP dipole radiation electromagnetic field calculation formula. Analysis of soil resistivity influence on frequency domain propagation characteristics, and analysis of lightning current and lightning strike point distance effect on the propagation characteristics. Compared with simplified model lightning current inversion analysis of inversion of amplitude lightning current and lightning current derivative, and then determine the accuracy of inversion. On the basis of pure conductor lightning formula of radiation field, on the ground for the height of the lightning channel is different, the height of the observation point and soil conductivity to analyze its impact on the spread of the magnetic field of the thunder and lightning, The simulation results verify the conclusion.Secondly, based on electric field strength, total media set up by the point matching method for solving matrix equation. Using subdivision results, application of FFT analysis different mountain height, lightning strike point and observation point distance for lightning radiation field and the mountain peak and the influence of the rise time, The simulation results verify the conclusion.Finally, the surface element method of moments and time domain integral method, establish a pure conductor lightning radiation propagation along the surface of the earth to the buildings above ground, the electromagnetic radiation of time domain integral equation, the analysis of lightning stroke point and building relative distance and the width and height of the building for lightning radiation field, the influence of the simulation results verify the conclusion. Analysis of lightning arrester under three kinds of model, based on the current, voltage and of lightning arrester under electric field, magnetic field is analyzed. According to three kinds of lightning arrester model best lightning protection scheme is put forward, combined with the actual project validates the effectiveness of the scheme.