| Since the opening of Beijing Tianjin high-speed railway in 2008,the number of high-speed railway invested and constructed in China has increased by leaps and bounds,gradually forming a network.By the end of 2019,China's high-speed rail operation has exceeded 35000 kilometers,and the opening and operation of ordinary speed railway has exceeded 130000 kilometers,ranking first in the world.Cable and trackside equipment are burnt due to electrification interference.Once such failures occur,they often affect a large scope,delay a long time,and seriously affect the safety and efficiency of railway transportation.In this paper,the interference of power frequency current on signal cable in traction power supply system of electrified railway is studied.Firstly,taking Wushaoling tunnel section of Lanzhou Xinjiang Railway as an example,the equivalent model of direct supply and return current power supply mode inside and outside the tunnel is analyzed.Secondly,the equivalent model of at power supply mode is analyzed by taking at traction power supply system of a certain place as an example,and the calculation method of line parameters is obtained The simulation models of two different traction power supply systems are built,and the current return and rail to ground potential distribution under different design and operation conditions are calculated.Finally,the crosstalk between current carrying conductor and signal cable is analyzed theoretically.Taking sptywpl03-8b railway digital signal cable as an example,the calculation method of electrical parameters of cable is analyzed,the simulation model of signal cable is constructed,and the longitudinal induction electric drive of direct supply with return current traction power supply system on railway digital signal cable is comprehensively simulated and analyzed under different connection modes of signal cable The magnitude of the potential.Through the comparison of the experimental results and theoretical calculation results,the accuracy of the simulation model is verified,and a general simulation model is formed,which is convenient for the simulation calculation of different power supply systems.The influence factors of reducing rail to ground potential are explored,and the magnitude of longitudinal induction electromotive force under different grounding modes of signal cable is studied,which provides relevant theoretical support for the design of new line and transformation of train power supply system. |
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