高速铁路接触网避雷线高度设计方法研究

高速铁路接触网架设避雷线后可以有效降低雷击跳闸率,保证高速铁路安全运行。结合现有的一些避雷线屏蔽计算方法,提出一种适合工程推广应用的避雷线高度设计方法,并得出以下结论:推导了单、复线铁路接触网避雷线高度设计的计算公式,计算过程简单便捷;避雷线高度对耦合系数以及雷击跳闸率影响较大,随着避雷线高度增加,F线、T线耦合系数逐渐减小。绕击跳闸率随着避雷线高度增加而逐渐降低,反击跳闸率增加,而总跳闸率逐渐降低,到一定程度后反而缓慢增加。在雷暴日不高地区,滚球半径推荐采用60 m;而在雷暴日较严重地区,推荐采用45 m。

Study on Design Method of Height of Lightning Conductor for High-speed Railway Catenary

The lightning conductor for high-speed railway can effectively reduce the lightning trip-out rate and ensure the safe operation of high-speed railway.This paper,combined with the existing calculation methods of lightning protection,put forward a design method for the height of lightning conductor suitable for engineering application.The following conclusions were made through this study.Based on rolling ball method,the height calculation formula of lightning conductor was deduced for the catenary of single-and double-track railway.The rolling ball method is simple and can be effectively applied to engineering application.It is found that the height of lightning conductor has a great influence on the coupling coefficient and lightning trip-out rate.The coupling coefficient of Line T and Line F decreases gradually with the increase of the height of lightning conductor.As the lightning conductor gets higher,the shielding failure trip-out rate drops gradually,while the trip-out rate of back striking rises.The total trip-out rate first decreases slowly to a certain point before it begins to increase slowly.The recommended rolling ball radius for areas with less thunderstorm is 60 m,and it is 45 m for areas with more thunderstorm.