双分裂线路短路电流作用下间隔棒载荷特性分析

Load characteristics analysis for spacers of twin bundle conductor lines under the action of short-circuit current

为研究双分裂线路发生短路故障时间隔棒的载荷特性,结合电力系统分析方法、载流导体电磁力理论和有限元方法,提出模拟发生短路故障时分裂导线和间隔棒动力响应的数值方法。针对双分裂线路,利用该方法对短路电流、导线型号、档距、间隔棒排布方式、子导线分裂间距、初始张力、高差和风速等对间隔棒受力特性的影响进行了参数分析。结果表明,数值模拟得到的间隔棒动力载荷最大值在短路电流较小时小于规程计算值,在短路电流较大时大于规程计算值,参数分析结果可为间隔棒的设计和安装提供重要依据和参考。

To study the load characteristics of spacers for twin bundle conductor lines during short-circuit fault,based on the power system analysis method,current-carrying conductor electromagnetic force theory and finite element method,a numerical simulation method for the dynamic responses of bundle conductor lines with spacers during short-circuit fault was proposed.The parameter study for analysing the effects of short-circuit current,conductor type,span length,spacer arrangement,spacing between sub-conductor,initial tension,elevation difference and wind speed on the load characteristics of the spacers of twin bundle conductor lines were performed by the presented numerical method.The numerical results reflect that the maximum load on a spacer during short-circuit fault determined by the presented method is smaller than that by the formula in the design code for smaller short-circuit current,but is larger than that for larger short-circuit current.The results obtained by the parameter study may provide important instruction for the design and arrangement of spacers for twin bundle conductor lines.