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 rh/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 rx 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,rh/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.
关键词
避雷针/保护角/高度影响系数/折线法/保护范围/雷闪距离
Key words
lightning rod/protection angle/height influence coefficient/broken line method/protection range/thunderbolt flashover distance
维普
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