Research On Sliding Electrical Contact Parameters Matching Of High Speed Pantograph-Catenary Current-Collecting System

Pantograph-catenary system is the key equipment to supply power for high-speed train.It is composed of the pantograph and the catenary. In recent years, the railway transportsystem constantly developed to high speed, heavy load, electrification, and network. Theselead to more and more complicated operation condition of the sliding electrical contactinterface between pantograph strip and contact wire. Such as wear of strip and contact wireincreased, arc erosion become severe, current-collecting quality is not stable, strip becomefracture, etc. These problems not only directly affect the service time of pantograph strip andcontact wire, but also affect the continuous running time, the traction of electric locomotive,the speed and the operation safety of the train.In order to ensure the reliability of power supply and the stability of current-collectingquality, further study on pantograph-catenary system electromechanical coupling performanceof high speed sliding electrical contact interface is useful to achieve the goal for reliablepower transmission. In this thesis, based on the main type of pantograph-catenary widely usedby our country’s high-speed railway, the quantitative relationship of parameters involved insliding electrical contact of pantograph-catenary system was researched.Firstly, according to the interaction model of pantograph-catenary system and theirrespective functions and structure characteristics, calculation model of pantograph andcatenary was established, and differential equations of pantograph-catenary coupling systemwere used to theoretically analyzes the main factors which influence the stability ofcurrent-collecting and the evaluation standards.Secondly, based on the macroscopic geometric shape and the micro fine structure theoryof contact surface morphology, there are a variety of micro-convexes on the surface of theprocessed materials. These conditions also show on the interaction surfaces of pantographstrip and contact wire. When electric locomotive collect current by pantograph from thecatenary, micro-convexes on the contact interface not only support the load, but also have totransmit current. At the same time, they must withstand the frictional heat and Joule heat(Joule heat generated due to the presence of contact resistance, so contact resistance is one ofthe important indexes to judge the reliability of current-collecting quality ofpantograph-catenary). In this thesis, based on the micro resistance characteristics ofpantograph-catenary electrical contact interface, a statistical model of high-speed slidingsurface was established, and the quantitative relationship were deeply analyzed among thecontact pressure, the real contact area, the contact number of spots and the speed affect thequality of pantograph-catenary current-collecting. Finally, using the test data of a passenger railway line in our country, the quantitativerelationship were studied among the speed of the train, contact pressure and contact resistance.The test results show that the analytical method is feasible and effective, which is a goodreference to study the sliding electrical contact interface resistance and evaluatecurrent-collecting quality for high speed pantograph-catenary. Furthermore, the deformationbetween strip and contact wire were analyzed by using the finite element method, thesimulation results show that fretting wear of strip is benefit to improving thecurrent-collecting quality.