In contrast to the conventional direct current railway electrification system(DC-RES),the medium voltage direct current(MVDC)-RES is considered promising for long-distance high-speed corridors.In the MVDC-RES,traction...In contrast to the conventional direct current railway electrification system(DC-RES),the medium voltage direct current(MVDC)-RES is considered promising for long-distance high-speed corridors.In the MVDC-RES,traction substations(TSSs)are placed much farther and train loads are much heavier than in the conventional DC-RES.Hence,the MVDC-RES brings a drastic change in catenary voltage,TSS spacing,and train loading,which affects rail potential and stray current.In this connection,this work performs some significant quantitative analysis of rail potential and stray current in the MVDC-RES environment.An MVDC simulation model is proposed and different grounding schemes are analyzed for a single-train and two TSSs scenario as well as for a multi-train multi-TSS scenario.According to the simulation and analysis,the maximum values of rail potential and stray current at MVDC-RES distances and the maximum safe distance between adjacent TSSs are determined.展开更多
With the rapid development of subway lines, more and more electrical problems of track structures are exposed, and the resulting impact is also attracting more and more attention. The electrical safety problems of tra...With the rapid development of subway lines, more and more electrical problems of track structures are exposed, and the resulting impact is also attracting more and more attention. The electrical safety problems of track structure are mainly manifested in three aspects: abnormal distribution of track potential, abnormal return of track structure and abnormal transition resistance of track to ground. Combined with practical engineering experience, common electrical problems and adjustment measures of track structure are summarized, which are used to further analyze the distribution law of track electricity and provide basic research data for solving the safety problems of track electricity.展开更多
文摘In contrast to the conventional direct current railway electrification system(DC-RES),the medium voltage direct current(MVDC)-RES is considered promising for long-distance high-speed corridors.In the MVDC-RES,traction substations(TSSs)are placed much farther and train loads are much heavier than in the conventional DC-RES.Hence,the MVDC-RES brings a drastic change in catenary voltage,TSS spacing,and train loading,which affects rail potential and stray current.In this connection,this work performs some significant quantitative analysis of rail potential and stray current in the MVDC-RES environment.An MVDC simulation model is proposed and different grounding schemes are analyzed for a single-train and two TSSs scenario as well as for a multi-train multi-TSS scenario.According to the simulation and analysis,the maximum values of rail potential and stray current at MVDC-RES distances and the maximum safe distance between adjacent TSSs are determined.
文摘With the rapid development of subway lines, more and more electrical problems of track structures are exposed, and the resulting impact is also attracting more and more attention. The electrical safety problems of track structure are mainly manifested in three aspects: abnormal distribution of track potential, abnormal return of track structure and abnormal transition resistance of track to ground. Combined with practical engineering experience, common electrical problems and adjustment measures of track structure are summarized, which are used to further analyze the distribution law of track electricity and provide basic research data for solving the safety problems of track electricity.
