The Parameters Calculation And Optimum Design Of High Speed Railway Integrated Grounding System

With the construction of the high-speed railway lines in our country, their grounding safe operation have been on the agenda, and must be lucubrate to meet the development. Compared to the traditional railway, high running speed, high running density, strong traction load current, strong short current lead to steep rail potential rise. If we don't take corresponding measures for the high rail potential, it may imperil human and machine safety and influence the trackside signal equipment work properly.Aiming to integrated grounding system of high-speed railway, Parameters Calculation of integrated grounding system and its optimum design are studied in this paper. The paper is begin with consideration of soil problems in grounding design, introduced a two-layer soil model and its calculation method and a grounding resistance calculation model of uneven soil grounding system is proposed. Both of them provide theoretical foundation for analyzing performance of grounding grids in power current. Next analyzed the parameters of grounding system on the industry frequency, discussed the voltage distribution of grounding system, fault current of grounding system, grounding safety requirements.In order to reduce the grounding resistance of grounding system, made a measure of composite grounding grid which is composed with a long vertical grounding electrode and level grounding grid, and validate the performance of the composite grounding grid; In order to make uniform distribution of the surface potential, uneven space layout of grounding grid is proposed, and validate its performance. According to the characteristics of all-parallel AT power supply system, effective methods to reduce rail potential are proposed, a integrated grounding system simulation model is built with the real parameters of all-parallel AT power supply system traction network and grounding system by Matlab / Simulink,which is validated by simulation.