Research purposes; At present, the high -speed railway in China is still in the development stage, and the high - speed railway network has not been formed in large - scale. In order to make up the shortage of high - speed railway network, some region - crossing high - speed trains have to run on the ordinary - speed railway lines. In this way, some ordinary -speed railway not only meet the demand of the existing busy passenger and freight transportation, but also meet the demand of running a large number of region - crosingl EMU trains, so it makes the traction power supply system in a serious overload stae.Research conclusions:Taking the section between Xiaoshan and Ningbo of the Hangzhou - Xiaoshan - Ningbo Railway as an example, the study was done on the tactics about the traction power supply system and the other systems in the long - term overload state according to the increasing sequence of traction load by stages. ( 1) The fixed values of the instantaneous interruption, the over - current and the overload protection value of the traction transformer were adjusted. (2) It was considered to take some measures for limiting the train running in the traffic organization. (3) It was consider to upgrade the traction transformer and its conductor wire on the primary and secondary sides, the power line, the contact wire and the OHL. (4) It was considered to add the heat overload protection and oil chromatographic on -line monitoring systems for the traction transformer.%研究目的:我国高速铁路目前尚处于发展阶段,没有形成大规模的高速铁路网,为了弥补高速铁路网的不足,部分跨区域的高铁列车需要在普速线路上“借道”开行,这样就导致了部分普速铁路在满足既有繁忙的客货运条件下,又要开行大量跨区域的动车组列车,致使电气化铁道牵引供电系统长期处于严重过负荷状态下.研究结论:本文以萧甬线(杭州萧山至宁波)为例,按照牵引负荷逐步增大的顺序分阶段研究了牵引供电及其他系统在长期严重过负荷状态(超设计条件)下的策略:(1)调整馈线速断保护、过流保护以及牵引变压器过负荷保护的定值；(2)在行车组织上考虑限车措施；(3)对牵引变压器及其一二次侧出线导线、上网供电线、接触网导线、所内流互等设备进行提升改造；(4)增设主变热过负荷保护以及油色谱在线监测系统等.
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