To address the challenge of rational setting of phase break when leading high-speed railways into terminals(areas)in shallow hilly terrain in central Sichuan,this paper took leading Chengdu-Dazhou-Wanzhou Railway into Ziyang West Station as the case for study,constructed a method of"multi-factor step-by-step study,multi-dimensional comprehensive comparison and selection,and verification by train operation under multiple working conditions"according to the characteristics of phase break involving upstream and downstream disciplines.It also studied the setting scheme of phase break gentle slope,and obtains a technical scheme that meets functional requirements,is technically reliable and economically reasonable.Key findings include:(1)When a new railway line is led into a station,the same phase of power supply usually supplies power to multiple lines in the yard.The end section post(phase break)shall be as close as possible to the station to reduce the traction load.(2)Boundary chainage of reverse power-off sign in neutral section=chainage of outermost signal at the station-length of first departure and third approach sections-0.2 km-0.5 km.(3)The train passes through the six-span short neutral section at a speed limit of 40 km/h,and the maximum up gradient is 5‰.(4)Under the shallow hill topography in central Sichuan,zoning site selection is not the main factor controlling the setting of phase breaks.(5)In the terminal(area),leading planned lines shall be considered as a whole for the setting of phase breaks,so as to avoid serious impact on related works of existing lines during the construction of planned lines.These findings can provide reference and guidance for similar projects.
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