影响广播中波转播站防雷系统作用的几个关键技术

电台中波转播站多建于城市近郊区,由于天线高耸落雷几率高,因而易受雷击干扰。针对建站时原已通过防雷验收的转播站设施在投入使用后依然频遭雷击受损的状况,分析了其防雷系统的内在布设技术问题,认为广播中波转播站原有防雷系统的一些关键技术缺漏是遭雷击受损的主要原因,并从转播站的实际情况出发,提出了转播站防雷设计的几个关键技术问题的解决方法：接地网逐级分流、屏蔽馈线再加设外屏蔽环群技术以及不同的线路、不同系统保护的配合方法等,从而形成广播转播站完整的防雷保护系统框架。

Several Key Techniques of Lightning Protection for Medium-Wave Broadcast Relaying Station

A medium wave broadcast relaying stations is usually built in the outskirts of a city. Because of the height of the antenna tower, these stations are attacked frequently by lightning strokes. Through analyzing technically the layout of the lightning protection system, it is found out that the main cause of the frequent lightning attacks is some leaks in the key techniques of the lightning protection system. According to the actual situation of medium wave broadcast relaying stations, some solutions are presented: stepwise shunting in the grounding grid, shielding feeder along with the technology of shielding rings, coordination of various circuits and systems, etc., so to form a complete lightning protection system frame for medium wave broadcast relays stations.