Overview of a dedicated rail return current technology for traction power supply systems in urban rail transit
In recent years,against the backdrop of urban rail transit systems utilizing a direct current power supply,a dedicated rail return current technology has been implemented to comprehensively address the issue of stray current leakage.In order to thoroughly comprehend the changes and impacts that the dedicated rail return current method has brought to urban rail transit construction projects,this article first employs a comparative approach.It compares the train operating rail return current method and the dedicated rail return current method in several aspects,including power supply system composition,traction substation spacing,grounding methods,grounding protection,train maintenance and static adjustment,loading gauge,as well as vehicle and track design.Secondly,a comparison is drawn among the characteristics of various current principles for the segmentation of dedicated rail power sections.The analysis concludes that aligning the dedicated rail sections with the electric sectional alignment of the returning part route proves more conducive to operational maintenance.Furthermore,the article briefly outlines engineering application cases where multiple lines share a common vehicle base for major overhauls,and cross-line operations involve different return current methods.Lastly,the article provides a forward-looking perspective on the future development of dedicated rail return current technology within the traction power supply system of urban rail transit.
urban rail transitstray currentdedicated raildedicated rail power sectionreturn current transition section
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