Study On Separation Between The Pantograph And Catenary Based On Improved Habedank Arc Model

At present, the development tendency of electrified railway in China is heavy load and high speed, the increase of traction load and train speed make the separation issue between the contact wire and the pantograph more prominent when passing the phase separations and registration points, leading to the decline of current-receiving quality. To ensure the safety of the traction power system and the reliability of the train and the electrical equipment, the research of the separation phenomenon between the pantograph and the contact wire when passing the phase separations and registration points and the impact of the dynamic characteristics of the arc generated in the separation process to the traction power system and the high speed train is of great importance. Most existing literatures ignore the impact of arc or adopt the existing black box arc models, few literatures build the mathematic model of arc appropriate for the pantograph-catenary system.The separation process between the pantograph and the contact line is chosen as the study object in this paper, a simple and effective mathematic model of arcs appropriate for the pantograph-catenary system is built, the simulation research of offline overvoltage is made based on the mathematic model of arc above.In the building process of the mathematic model of arc, the generating mechanism and the dynamic characteristic of the separation arc between the pantograph and the contact line are analysed in detail. Combining with the existing black box model of the arc, on the basis of the data reflecting the largest separation distance and the train speed, the constant of voltage gradient uc and the constant of power-loss PO in Habedank model are corrected. Considering the train speed ν as an variable, the mathematic model of arcs appropriate for the pantograph-catenary system is built. The influence of the value of k and β to the dynamic characteristic of the arc model is also analysed, and the validity of the proposed model is primarily tested.In the simulation of the overvoltage generated when the high speed train passes the phase separations, four transient circuit models are built, the parameters of the models are calculated theoretically. The process of the high speed train passing the phase separations is simulated. The influence of the moment when the high speed train enters and exits the phase separation to the transient voltage is analysed. The arc model above is introduced to the transient processes and the waveform gained is compared to the waveform gained from field tests. It can be concluded that the simulation results are more consistent with the real measured waveform when considering the mathematic model of arc. The phase separations passing process with several arc reignites are also simulated. Considering train speed as a variable, the overvoltages of the pantograph head in different speed is simulated under the medium offline process. Simulation results show that the peak of overvoltage is proportional to the train speed. The simulation result of the short offline is compared to the measured results in SWJTU high voltage laboratory. The accuracy of the simulation and the mathematic model of arc is verified.