Lightning Protection Loopholes and Improvement of Determining the Protection Range of Lightning Rod by Broken Line Method
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.
lightning rodprotection angleheight influence coefficientbroken line methodprotection rangethunderbolt flashover distance
万方数据
维普
