滚球法防雷保护范围边界条件示例分析

摘要

Through the analysis of the essential connotation of the rolling sphere method, the drawbacks of traditional mapping method for the designers were pointed out, the reverse use of rolling sphere method to calculate the lightning rod height and how to determine the scope of protection of the lightning rod and lightning line on the slope were studied and analyzed, the significance of the boundary conditions in the process of using rolling sphere method to determine the scope of lightning protection was clarified. In the process of using the rolling ball method to reverse calculate lightning rod height, taking that applying the double same height lightning rod to protect spherical tank as a specific example, a new quantitative calculation method was proposed, which was based on accurate delineation of the scope of protection of critical curve, using geometric principles to determine the scope of protection in the rolling sphere method for the reverse calculation. Taking the analysis of the scope of protection of the different elevation of the ground for wedging, and taking the lightning rod and lightning line on the slope surface to protect the building as example, the formula for the protection scope of the lightning rod and lightning line on the slope and the method for determining the boundary line of protection scope were proposed.%通过剖析滚球法的本质内涵,指出了设计人员传统作图法的弊端,研究分析了逆向运用滚球法确定接闪杆高度的计算方法以及如何在斜坡地面上确定接闪杆、接闪线的保护范围,阐明了在利用滚球法确定防雷保护范围的过程中边界条件的重要意义.在运用滚球法逆向计算接闪杆高度的过程中,以双支等高接闪杆保护球形罐体为特定示例,提出了新的定量计算方法,即在准确划定保护范围临界曲线的基础上运用几何原理对滚球法确定保护范围这一过程进行了逆向计算.以分析不同标高地面的保护范围为契点,斜坡面上接闪杆、接闪线保护建筑物为示例,提出了斜坡面上接闪杆、接闪线保护范围的计算公式以及保护范围边界线的确定方法.