Abstract
Running rails used as a return conductor and ungrounded scheme have been widely adopted in DC traction power systems. Due to the longitudinal resistance of running rails and insulation resistance of rail-to-ground, there will be a potential rise between running rails and the ground when return current flows through the running rails, which is known as rail potential. At present, abnormal rise of rail potential exists widely in DC traction power systems. The present rail potential model still cannot simulate and explain the abnormal rail potential in the system. Based on the analysis of power distribution with multiple trains running in multiple sections, a dynamic simulation model of rail potential in the whole line is proposed. The dynamic distribution of rail potential and stray current in DC traction power systems when multiple trains run in multiple sections is analyzed, and the impact of traction current distribution on rail potential is evaluated. Simulation results show that the abnormal rise of rail potential during the dynamic operation of the system can be evaluated effectively.
Highlights
Direct current (DC) traction power systems with an ungrounded scheme are widely used in urban rail transit lines; the running rails are usually used as return conductor
The impact of power distribution on rail potential when multiple trains run in multiple sections has broadly been ignored, and the abnormal rise of rail potential in the actual line has not yet been clarified
When multiple trains run in multiple sections, traction current distribution is affected by the parameters of rectifier units, the train’s running modes, as well as the coincidence degree of the trains, parameters of regenerative braking energy absorbing device (RBEAD), line parameters, etc
Summary
Direct current (DC) traction power systems with an ungrounded scheme are widely used in urban rail transit lines; the running rails are usually used as return conductor. The impact of power distribution on rail potential when multiple trains run in multiple sections has broadly been ignored, and the abnormal rise of rail potential in the actual line has not yet been clarified. The impact of traction current distribution on an abnormal rise of rail potential when multiple trains run dynamically in multiple sections is lack of accurate modeling and analysis. Field tests and simulations show that traction current transferring over sections widely exists in DC traction power systems, theillustrates abnormalthe rise of railofpotential during theon dynamic operation of the system be This and paper impact power distribution rail potential. Potential based on power distribution when multiple trains run in multiple sections is established, thereby clarifying thethereby abnormal rise the of rail potential inrail thepotential actual line
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