大跨越高压输电线路覆冰断线的冲击动力学模型

Impact dynamics model of long span high voltage transmission lines subjected to iced wire breakage

为了从理论上揭示大跨越高压输电线路覆冰断线的冲击动力响应,针对大跨越高压输电导线分裂布置型式的线路覆冰情况,采用等效单根导线代替分裂导线,利用能量法,建立了覆冰断线的冲击动力学模型。以某大跨越高压输电线路的一个典型耐张段为例,应用该模型计算导(地)线覆冰断线和未覆冰断线工况下对铁塔造成的冲击响应。研究表明:覆冰断线造成的冲击动力响应远大于未覆冰断线情况,覆冰断线冲击响应不容忽视。该模型可为大跨越高压输电线路覆冰断线的冲击动力响应试验分析与数值计算提供理论依据。

In order to theoretically reveal the impact dynamic responses of long span high voltage transmission lines subjected to iced wire breakage,the impact dynamics model for long span high-voltage transmission lines with iced bundled conductors was developed comprehensively by using an equivalent single iced conductor instead of bundled conductors.The impact dynamics model of iced wire breakage was derived by using energy method.Taking a typical tension section of long span high-voltage transmission line as an example,the impact responses under iced wire breakage and non-iced wire breakage were computed by using this model and a good agreements were achieved.The results show that the impact dynamic response under iced wire breakage is larger than that under non-iced wire breakage,so the impact dynamic response due to iced wire breakage should not be ignored.The model can provide a theoretical basis for experiments and numerical simulations of long span high voltage transmission lines under iced wire breakage.