相分段自动转换装置是为电气化铁路高速、重载运输而研制的重要技术装备之一 ,能产生较好的经济和社会效益。同时对接触网相分段自动转换装置的工作原理、技术关键、主要特点、研制试验及其在宝成线扩能工程中的应用情况作了较全面的介绍。 Phase-by-stage automatic conversion device is one of the important technical equipment developed for high-speed and heavy-haul transportation of electrified railway, which can produce better economic and social benefits. At the same time, the working principle, technical key, main features, research and development test and application of automatic phase change device of catenary phase are introduced in detail.