输电线路元件的结构可靠度分析

Structural Reliability Analysis of Transmission Line Elements

为正确评价输电线路的安全性,本文以输电线路元件(导地线、绝缘子和金具)作为分析对象,建立了可靠度分析模型,通过分析影响输电线路元件荷载效应的永久荷载、风荷载的计算公式以及分布曲线,得到荷载效应的统计参数;考虑材料性能不定性、几何参数不定性和计算模式不定性,得到抗力统计参数。采用一次二阶矩方法,计算得到输电线路元件在大风工况下的可靠度指标。结果表明,按现行输电线路规范的安全系数设计的输电线路元件,其可靠度水平较高。

For the correct evaluation of the safety of the transmission line, taking the transmission line elements （conductor＆amp;earth wire, insulator and hardware） as the analysis objects, the reliability analysis model was established, by analyzing the affecting factors of load effect of transmission line elements such as the calculation formula and distribution curve of permanent load and wind load, the statistical parameters of load effect were obtained;Considered the uncertainty of material properties, geometry and computational model, the resistance statistical parameters were obtained. Using a second-order moment method, calculated the reliability index of the transmission line element in maximum wind condition .Results show that the reliability level of the transmission line elements designed by current speciifcation of safety factor was high. The calculation results can provide reference for the establishment of probability limit state design methods of the transmission line.