多集中荷载连续档架空线应力计算方法  

Calculation Method for Tension of Multi-concentrated Load in Continuous Span of Overhead Transmission Line

作　　者：刘晨 李永双 唐剑 LIU Chen;LI Yongshuang;TANG Jian(Electric Power Planning&Engineering Institute Co.,Ltd.,Beijing 100120,China)

机构地区：[1]电力规划总院有限公司,北京100120

出　　处：《高电压技术》2021年第12期4288-4297,共10页High Voltage Engineering

基　　金：电力规划设计总院科技项目(K201908-T)。

摘　　要：在架空输电线路上加装防舞、警航等装置,可视为在架空线上施加了多个集中荷载,因此不可避免地会对架空线力学特性产生影响。目前行业内在进行工程计算时,通常将多个集中荷载等效为均匀分布在架空线上的均布荷载,因此无法反映集中荷载的作用特点。为此,提出了多集中荷载连续档架空线等效比载计算方法,该方法充分考虑了多集中荷载重量、数量、安装位置等因素对架空线力学特性的影响,提高了计算准确性。工程计算结果表明:传统基于均布荷载假设的方法由于无法考虑多集中荷载布置方式的影响,因此得到的等效比载偏小,相应应力和弧垂结果也偏小;而所提方法克服了上述不足,因此比传统方法更为准确。研究结果可为连续档多集中荷载的工程计算提供参考。Anti-galloping devices and marker balls may be treated as multi-concentrated loads applied to overhead transmission lines, which will inevitably impact the tension and sag characteristic of the conductor. Previous engineering calculation is usually based on the uniform distributed load assumption which cannot reflect features of concentrated load.For this purpose, a novel method for calculating tension of multi-concentrated load on overhead transmission lines is proposed, where the effects of weight, quantity and position of the multi-concentrated load on the mechanical characteristics of overhead transmission lines are fully considered, and calculation accuracy is improved. Results of engineering calculation indicate that the equivalent loads as well as the tension and sag obtained by traditional method based on the uniform distributed load assumption are less than those by the proposed method due to ignoring layout of the concentrated loads. The proposed method overcomes above drawbacks and thus is more accurate compared with the traditional method.This research is helpful for engineering calculation of multi-concentrated load in continuous span of overhead transmission lines.

关 键 词：架空线 集中荷载 布置方式 等效比载 应力计算 弧垂 

分 类 号：TM75[电气工程—电力系统及自动化]