10kV配电线路架空避雷线结构应力分析

Structural Stress Analysis of Overhead Lightning Arrester for 10 kV Distribution Line

在架设避雷线的设计中,避雷线的弧垂、应力和线长计算至关重要,是配电线路力学研究的主要内容。针对10 kV架空配电线路均布载荷下避雷线的弧垂、线长、应力以及悬链线方程,建立考虑杆塔类型、气象环境等因素的计算模型;针对避雷线,通过改变档距、线长进行结构应力仿真。对10 kV架空配电线路架设避雷线进行结构应力分析,得到架空避雷线最低点应力随线长的增长而减小,且最初下降速度较快,在临界线长附近下降速度放缓,最后趋于平坦;架空避雷线弧垂随线长的增长而增大,且最初上升速度很慢,在临界点附近上升速度加快。在50 m档距的情况下,线长为59.959 m的情况为最大安全应力临界点;在80 m档距的情况下,线长为79.949 m的情况为最大安全应力的临界点。

In the design of lightning arrester,the calculation of sag,stress and line length of lightning arrester is very important,which is the main content of distribution line mechanics research.Aiming at the arc sag,line length,stress and catenary equation of lightning arrester under uniform load of 10 kV overhead distribution line,the calculation model considering tower type and meteorological environment is established,and the structural stress simulation of lightning arrester is carried out by changing the spacing and line length.Structural stress analysis of lightning arrester for 10 kV overhead distribution lines shows that the lowest point stress of overhead lightning arrester decreases with the increase of line length,and the initial descent speed is faster,the descent speed slows down near the critical line length,and eventually tends to be flat;the arc sag of overhead lightning arrester increases with the increase of line length,and the initial ascent speed is very slow,and the ascent speed accelerates near the critical point.In the case of 50 m spacing,the critical point of maximum safety stress is 59.959 m in line length,while in the case of 80 m spacing,the critical point of maximum safety stress is 79.949 m in line length.