自立式双回路铁塔送电线路导线断裂后的结构动响应分析

为了研究机械性故障对自立式双回路铁塔输电线路结构的受力影响，建立了500kV架空输电线路耐张段的耦合体系模型，采用瞬态动力分析方法计算了高压交流输电线路耐张段一基塔在发生上横档一组导线突然断裂破坏后，邻近破坏处的导线、绝缘子、塔构件的瞬态动响应变化规律。分析结果表明，上横担一组导线断裂失效对邻近端导线张力峰值没有明显影响，对邻近端的绝缘子及铁塔横担构件的受力有较大的影响。研究成果可为输电线路结构设计提供理论依据。

Transient response of high voltage transmission lines with self-supporting double-loop steel towers in the case of cable rupture

In order to study the dynamic response of high voltage transmission lines with self-supporting double-loop steel tower under mechanical fault, the non-linear dynamic finite element model of a domestic 500kV high voltage transmission line system was established. The reliability of coupling system model was verified by static calculation results. Transient dynamic analysis method was proposed to analyze the variation law of dynamic response under cable rupture. The results show that upper crossarm cable rupture has no effect on cable tension at adjacent suspension points, but it has significant influence on tension in the insulator and tower component of upper crossarm next to the broken span. The research results can provide the theoretical base for the design of transmission line.