Analysis of Tactics about Traction Power Supply System in Long-term Overload State

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.