接触网雷击跳闸率的新算法

A New Algorithm for the Lightning Outage Rate of the Catenary

结合接触网的受雷情况和结构特点建立接触网的雷击模型,分别给出线路遭受直接雷击和感应雷击时接触网的耐雷水平计算公式。基于广义积分法,提出计入感应雷击的计算接触网雷击跳闸率的方法。以常见的复线接触网为例,按照给出的模型和计算方法计算接触网的跳闸率,并将计算结果与实际情况比较。研究结果表明:接触网遭受感应雷击时的耐雷水平较低,因感应雷击造成的接触网雷击跳闸次数占总雷击跳闸次数的31.6%,感应雷击对接触网的跳闸影响是明显的;计入感应雷击计算的总跳闸次数更接近实际运行值。

Combined with the lightning mechanism and the structure characteristics of the catenary, the lightning strike model of the catenary was established. The formula was presented respectively for calculating the lightning withstand level of the catenary under direct and indirect lightning strike. Based on the generalized integral method, a new algorithm for calculating the lightning outage rate of the catenary which included indirect lightning was put forward. Taking the familiar double circuit catenary for example, the lightning outage rate of the catenary was calculated according to the given model and the algorithm, and the calculated results were compared with actual situation. Results show that the lightning withstand level of the catenary under indirect lightning is lower. Since indirect lightning outage rate accounts for 31.6% of the total lightning outage rate, the influence of indirect lightning on the catenary is obvious. The total lightning outage rate is closer to the the practical running result.