计及风沙磨损的架空输电线路冰风荷载失效概率评估方法

Failure Probability Assessment Method for Overhead Transmission Lines under Ice and Wind Loads considering Blowing Sand Wear

摘要: 新疆地区输电走廊所处气候环境恶劣，导线经历风沙磨损后会导致强度损失，尤其在冰冻天气下，导线覆冰后加上大风激励容易发生线路结构失效，研究计及风沙磨损的线路冰风荷载失效概率评估方法具有重要意义。本文根据微气象监测装置，基于覆冰厚度预测模型计算冰荷载，然后依据强度干涉理论，通过对冰风组合荷载与风沙磨损后导线剩余强度进行比较，动态评估输电线路的失效概率。最后通过新疆地区某实际案例的反演分析，对所提方法的可行性和有效性进行验证。研究有助于运行人员及时校核输电线路运行状态，防范因导线覆冰和大风导致的故障。

Abstract: The transmission corridor in Xinjiang is exposed to a severe climate; the strength of the overhead line will be lost after being subjected to blowing sand wear. Especially in the freezing weather, the wind excitation plus icing is prone to structural failure of the overhead line. It is of great significance to study the failure probability evaluation method of the overhead line under ice and wind loads considering blowing sand wear. In this paper, the ice load is calculated according to the ice thickness prediction model based on the micro-meteorological monitoring devices. Then, according to the strength interference theory, the failure probability of the transmission line is dynamically evaluated by comparing the residual strength of the transmission line after blowing sand wear and the ice and wind combination loads. Finally, the feasibility and effectiveness of the proposed method are verified through the inversion analysis of an actual case in Xinjiang. The research results are helpful to check the operation status of the transmission line timely and prevent the failure caused by the line icing and strong wind.