Cheng Ye

Extended black-box model of pantograph arcing considering varying pantograph detachment distance

Pantograph arcing is a more and more prominent phenomenon as the increase of pantograph-catenary interaction, especially when the detachment of pantograph-catenary happens. A large amount of arc models are established on train system in order to analyze the influence of pantograph detachment arcing, but have the limitation of setting the pantograph detachment length to a constant. To solve the problem, this paper introduces the dynamic process into the pantograph detachment length, and proposes an extended black-box model of pantograph arcing considering varying pantograph detachment distance. At first, based on Habedanks arc equations, two parameters, including voltage gradient and power dissipation, are studied and extended to reflect the relation between varying pantograph detachment distance and equation of arc model. Then, by the state-space model analysis on MATLAB software, deduced arc characteristic waveforms under the dynamic process is presented, and the effectiveness of extended black-box model is validated on a simplified integrated circuit model of trains running in traction network with pantograph arcing. Finally, the dynamic process and static process of the arc models is compared and some analyses are made to evaluate the presented extended arc model under different changing processes.

Modeling analysis of electric multiple units passing insulated rail joints in high-speed railway station

Arc burning phenomenon of insulated rail joint at cut-off point is one of important challenges in high-speed railway (HSR) stations. In order to study this issue in specific, by utilizing MATLAB/Simulink software, the equivalent integration model of electric multiple units (EMU) running in the station traction network is established to perform simulation analysis. The actual traction power supply mode and chain model considering inductive coupling and capacitive coupling of each conductors are considered for the station traction network. The CRH380BL-type EMU is taken as an example and its grounding system is considered in detail for the EMU model. The transient process of the EMU wheel passing the insulated rail joint at cut-off point is divided into two parts, including the wheel bridges the cut-off point and leaves the cut-off point with an arc generated. The simulation analyses of each transient process and integrated process are performed, respectively. By compared with existing literatures, the effectiveness of modeling analysis is verified, and the reference for researching and solving the arc burning problem of insulated rail joints is provided.