基于改进电气几何模型的某500 kV山区输电线路差异化防雷改造

Differential Lightning Protection Reconstruction of a 500 kV Mountainous Transmission Line Based on Improved Electrical Geometry Model

雷电是造成高压输电线路故障的重要原因,为确保输电线路的安全可靠运行,准确评估线路耐雷性能具有实际意义。从绕击计算模型等方面出发,综合考虑地面倾角、雷电入射角等影响,采用了改进的电气几何模型来进行防雷评估计算。并对500 kV山区输电线路进行差异化防雷改造,首先统计该输电线路的雷电、地形地貌、杆塔等参数,基于改进的电气几何模型逐基杆塔计算绕击跳闸率,评估雷害风险等级及耐雷性能,根据评估结果有针对性的选择防雷措施进行防雷改造,为保证供电的安全可靠,提高防雷改造的经济性奠定了基础。

Lightning is an important reason for the failure of high voltage transmission lines. In order to ensure safe and reliable operation of transmission lines,it is practical significance to accurately evaluate lightning protection performance of the lines. From the aspects of the collision calculation model and so on,considering the influence of ground obliquity and lightning incident angle,the improved electrical geometric model is used to evaluate the lightning protection. And the 500 kV mountain transmission line carry out differentiated lighting protection transformation,first of all,to elevated statistics of the transmission line of lightning,topography,tower and other parameters,based on improved electrical geometry model by the tower to calculate the value of the trip to assess the level of lightning damage and mine Performance,according to the evaluation results of targeted selection of lightning protection measures for lighting transformation,in order to ensure the safe and reliable power supply,improve the economy of mine protection laid the foundation.