Development Of Pantograph-Catenary Arc Simulation System And Experimental Research

Along with the development of high-speed electrified railway and the support from related national policies, great railway speeding and construction have been in rapid development domestically. However, the higher the locomotive speed is, the more unstable the pantograph-catenary relationship is, and the more serious the offline situation is. Pantograph-catenary arc created by transient offline would erode contact line and pantograph, generate overvoltage and high-frequency noise, and lower quality of power supply, posing a great threat to the safe and stable operation of electrified railway. Therefore, it has a significant meaning to change the quality of power supply of electrified railway, reducing the erosion to contact line and pantograph and enhancing the operation safety of electrified railway by investigating pantograph-catenary arc's impact and inhibitory measures on electrified railway, which would also provide theoretical support to the rapid development of railway.With pantograph-catenary arc as the object of study, this thesis designs a pantograph-catenary arc simulation system, of which the contact net part is composed by close contact lines fixed in the insulating disc and is driven by a reducing motor. The rotation of the reducing motor drives the contact line to rotate, simulating the tangential motion between pantograph and the contact net. The pantograph part is driven by a stepper motor with a MCU controlling its rotary movement, and the movement is changed into linear motion via ball screw to make it touch or separate from the contact line.This thesis also designs a pantograph-catenary arc data collection system. First, pantograph-catenary arc voltage and current are converted into voltage signals through a sensor, after which these signals will be converted into ones suitable for analog-to-digital conversion by means of a signal conditioning circuit. Then analog signals will be turned into digital signals via AD converter under the control of the MCU. Finally, the MCU will upload the data to the host computer through communication circuits and data transmission circuits.In addition, this thesis sets up a pantograph-catenary arc experimental system by making use of the pantograph-catenary arc simulation system and data collection system. The researcher first makes an experiment on contacting electric arc and breaking arc under general circumstances and analyzes the influence of the field electron emission and thermal electron emission on voltaic arc; then an experiment is made on the phase relationship between the arc voltage and arc current; after that, the author experiments and analyzes opening travel's impact on arc current and maximum breaking arc voltage, the effect of load power on max arc opening travel. Finally, general rules of pantograph-catenary arc are investigated.All the research this thesis does lays a good foundation for understanding the mechanism of pantograph-catenary arc; at the same time, it also provides theoretical support to the development of the high-speed railway and the safety of rail transport.