用于弧垂微调的架空输电线路电线力学计算

Mechanics Calculation for the Sag Fine Adjustment of Overhead Transmission Lines

对架空输电线路弧垂微调时,通过经验和计算机辅助程序无法很好地反映线长、弧垂及应力三者关系。为此,基于架空输电线路的电线力学基础理论,推导出悬链线、平抛物线和斜抛物线3种导线悬挂曲线解析方程,并由此分析了档距、高差系数对线长和弧垂的影响以及档距、线长、弧垂及应力间的相互关系。结果表明:在实际工程应用中,可以根据不同的高差系数和档距,分别选择平抛物线和斜抛物线两种简化的解析方程进行输电线路弧垂计算和展放,其计算结果均能满足工程精度要求。

During the sag fine adjustment of overhead transmission lines,experience and computer-aided programs cannot reflect the relationship among the line length,the sag and the stress well.Therefore,the analytical equations for the suspension curves of three types of conductors:the catenary,the flat parabola and the oblique parabola are derived based on the basic theory of line mechanics for overhead transmission lines.The influence of the span,height difference coefficient on the line length and the sag and the interrelationship among the span,the line length,the sag and the stress are analyzed.The results show that in practical engineering applications,two simplified analytical equations including the flat parabola and the oblique parabola can be used to calculate the transmission line sag and the deployment according to different height difference coefficients and spans.The calculation results can meet the project precision requirements.