Abstract：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．
王 永. 牵引供电系统在长期过负荷状态下的策略分析[J]. 铁道工程学报, 2012, 29(5): 54-57.
WANG Yong. Analysis of Tactics about Traction Power Supply System in Long － term Overload State. 铁道工程学报, 2012, 29(5): 54-57.
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2012, Vol. 29 
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