Effect Of Contact Loss Between The Pantogragh And Catenary On The High-Speed Train

In recent year, occasional accidents has happened several times due to the contact loss in the present high-speed railway system. Therefore, to guarantee the operation of the train and its electrical equipments, research in the interaction between the contact loss and the high speed train is one of the desperate needs.Though the event that pantogragh deviates from catenary has been reported, which focuses on the over-voltage of separation between the pantogragh and the catenary, arc detection technology of the separation between the pantogragh and catenary, and electromagnetic interference caused by arcs in pantogragh-catenary system But the interaction between the high-speed train and the contact loss has never been reported.In this paper, we aimed at the interaction between the contact loss and the high-speed train. Firstly, we summarized the characteristics and the criteria of the pantogragh and catenary current collection., and pointed out that the length of time in the contact loss can be metric in appraising the current collection quality of the high-speed train. Secondly, we analysed the causality, characteristics and consequences of the electrical arc when the pantogragh deviates from catenary. And thirdly, we built a simulation model of arc based on an energy metric.Considering the common traction transformer and the catenary of the high-speed railway system in our country, we considered CRH2and CRH3type EMU as the object, calculated the related technichal parameters of the high-speed train intermediate DC loop based on the power balance relationship, and built a traction power supply system equivalent circuit model and the high-speed train model on the principles of transient current control.We conducted a simulation analyses, aiming at the interaction between the contact loss and the inrush current of the transformer in CRH3type EMU, with the process of the contact loss between the pantogragh and the catenary and classification of it in account. Our result indicated that the inrush current was related to the magnitude of the residual magnetism in the iron core of transformer and whether the arc was pulled apart.Finally, we conducted a simulation analyses, aiming at the interaction between the contact loss and the traction power of the high-speed train. Our result indicated that the tracion power decreases with the increase of the arc resistance varying range when the arc does not pull off during the contact loss.