Analysis And Calculation On Impact Of Detection Station Of Lightning Location System From Surrounding Buildings

Lightning location system provides a good platform and data base for power system of lightning protection. In order to facilitate the supply and implementation the commissioning of its maintenance, detection stations of lightning location system were generally layout in the city. However, buildings in the city are maked up by concrete structure, which contains a large steel mesh. When the lightning return stroke occurs, due to its strong current, there will have electrostatic induction and electromagnetic induction in the mesh, resulting in lightning electromagnetic field signals distortion in the communication process. When using the lightning electromagnetic field interference signals to calculate lightning parameters, because of the original data error, it will lead to inaccurate results, and therefore the various effects of thunder and lightning made wrong judgments, leading to misuse in a variety of engineering applications. Therefore, the study of lightning electromagnetic field signals in the building space propagation is essential.This paper was based on the transmission line model of lightning return stroke and double-exponential current model parameters of lightning return stroke channel bottom, analysis the effect of the lightning return stroke parameters-return stroke speed and height of the lightning return stroke channel to lightning electromagnetic fields space radiation.As the earth is infinite perfect electric conductor, the authors get the use of the method of moments, calculate the effects on lightning magnetic field received by detection stations which has been placed on top of lightning. Then summed up the relevant law, and provided a theoretical basis for future exploration.When the detection stations were placed on the surface of the earth, by comparing the different sizes and different distance between buildings to lightning points, and analysis the influence to lightning magnetic field signal from buildings nearby, the author comes to the conclusion that when placing detection stations, distance from buildings should be twice larger than the height of the building.