Research on the motion and dynamics modeling of pantograph-catenary arc under low air pressure and strong airflow

Abstract

The pantograph-catenary faults seriously threaten the safe operation of high-speed railways. In the environment of high-altitude and low air pressure, the maintenance ability of pantograph-catenary arc is enhanced, the longitudinal drift velocity and height of arc column are greater, and the arc root jumps frequently, which leads to more harmful effects. Therefore, it is urgent to carry out research on the movement characteristics of the pantograph-catenary arc and its influence mechanism under low air pressure and strong airflow. Based on the low air pressure pantograph-catenary arc test platform, the influence of low air pressure and strong airflow on the development process and movement characteristics of pantograph arc are studied. A multi-stress coupled pantograph-catenary arc movement model is established, revealing the influence of low air pressure and strong airflow on the pantograph-catenary arc movement characteristic. The results show that in the early and middle stages of the arc movement development process, the electromagnetic force is mainly determined by the electromagnetic force, and the later stage is mainly determined by the wind load; the air pressure and air velocity have a significant influence on the thermal buoyancy and wind load, making the arc stretching and arcing more serious. The buoyancy increases with the decrease of air pressure, which is the root cause off requent jumps of anode arc roots and short circuit of arc columns.