【摘要】 用现行折线法确定避雷针高度为h的保护范围，由于没有考虑h的有效保护范围的影响，单支h及两支等高h之间的保护范围均存在防雷漏洞。分析了这些防雷漏洞，并对折线法进行了改进：设h=30 m时h在0.5h高度处的有效保护半径为r_h/2=15 m,h的圆锥体及圆台体保护范围的地面有效保护半径分别为r₀₁=30 m,r₀₂=45 m,推导出当h>30 m时，h对圆锥体的保护角α′及h在任意高度处的保护半径r_x的计算公式；取D<2r₀₁或D<2r₀₂限制两支等高h的针间距离，按h₀=r₀₁或h₀=r₀₂为半径的圆弧确定两支等高h的针间保护范围。改进后随着h的增高，α′减小，r_h/2、r₀₁、r₀₂保持不变，单支h的保护范围被拉高变窄，单支h及两支等高h之间的保护范围均在h的有效保护范围之内，有效堵住了折线法的防雷漏洞。更多还原

【Abstract】 The current broken line method is used to determine the protection range of lightning rod with a height of h,because the effective protection range of h is not considered, there are lightning protection loopholes protection range of between single h and two equal height h.This paper analyzes these lightning protection loopholes, and improves the broken line method: When h=30 m, the effective protection radius of h at a height of 0.5h is r_h/2=15 m, and the effective protection radius of the ground of the protection range of cone body and roundtable body of h are respectively r₀₁=30 m and r₀₂=45 m.The formula for calculating the protection angle α′ of h to the cone body when h>30 m and the protection radius r_x of h at any height are derived.Take D<2 r₀₁ or D<2 r₀₂ to limit the distance between the two equal height h,and determine the protection range between the two equal height h according to the arc of h₀=r₀₁ or h₀=r₀₂ as the radius.After the improvement, with the increase of h,α′ decreases, r_h/2,r₀₁ and r₀₂ remain unchanged, and the protection range of single h is increased and narrowed, and the protection range between single h and two equal-height h is within the effective protection range of h,effectively blocking the lightning protection loophole of the broken line method.更多还原