Study Of Dynamic Characteristic For High Speed Railway Pantograph Arcing

High-speed is trend of electrical railway development all over the world. Higher and higher speed is the seek purpose for various countries. The mode of import, digestion, absorption and re-innovation of technology has greatly contributed to the development of high-speed railway in China. Pantograph-catenary system is one of three key systems of high-speed electric railway. So its service performance has great influence on the train’s reliable and safe running. Because of the phenomenon "contact-abruption-contact" of pantograph-catenary system, with the increase of train speed, electric contact and abruption of pantograph-catenary system are alternated more and more quickly. During the alternation process, contact resistance of pantograph-catenary system increases, power quality from catenary reduces. When the pantograph and catenary is separated, pantograph-catenary arc would occur. The arc will ablate catenary wire and pantograph sliding board, and distort voltage and current waveform, as well as reduce the power quality. The arc greatly impacts the train’s reliable and safe running.Running process of high-speed railway pantograph-catenary system was studied. According to the deficiency of traditional pantograph-catenary system test device (tray-pin structure), based on the coupling of actual pantograph-catenary system, pantograph-catenary arc test device of flexible line contacting flat line as well as arc information collection synchronous system were developed. The contact wire is fixed in the grooves around the outer edges of the two wheels. When the driving wheel is driven to rotate by the variable speed motor, the driven wheel and the contact wire moves together with it, which can simulate horizontal movement. This apparatus can achieve zigzag movment and vertical libration based on it used the servo control systems and roller screws technology. The arcing voltage acquisition used broadband bridge resistance-capacity partial pressure sampling method according to the pantograph arcing voltage’s mutability, the voltage singal route by isolation amplifier, send to high speed acquisition unite, in order to realize the arcing voltage arcing current and acrcing morphology synchronous acquisition. It has laid the experimental foundation for researching the character of pantograph electrical contact and pantograph arcing. The contact shapes of pantograph-catenary system and the mechanism of contact resistance for pantograph-catenary system were studied. the relationships among contact resistance, contact morphology and spot temperature were analyzed. A novel contact resistance model for pantograph-catenary system has been established and verified the model by experiment. The relationships among contact resistance, slide speed, contact force and collecting current were studied.Occurring, development, extinguishing law and its mechanism of pantograph-catenary arc under high-speed sliding and beating process were investigated. The influence of abruption and electrode material of pantograph-catenary system, import current, load characteristic on pantograph-catenary arc was analyzed. Impact law of pantograph-catenary arc was obtained. It has laid the experimental foundation for the spatial and temporal distribution model of pantograph-catenary arc.The spatial and temporal distribution model of pantograph-catenary arc was gained. Based on the model, the impact of the phase of arc, abruption position on overvoltage of traction system was studied. Suppression measures for arc inducing traction system overvoltage were proposed.