Application And Improvement Of Asymmetric High Voltage Pulse Track Circuit

The track circuit which plays an important role in railway signal system is the important device to ensure the security of railway train traffic safety and centralized control.If the track circuit problems occur,it will seriously affect the normal running of the railway,and even cause serious traffic accidents.Asymmetric high voltage impulse track circuit has a unique advantage in anti interference ability and its own sensitivity.In the design process of the actual project,because the railway station track circuit types station using asymmetric impulse track circuit at this stage is not practical,so when the asymmetric impulse track circuit and other types of track circuit coexist,you need to avoid mutual interference considering possible and other derivative problems to guarantee the safety of train operation.The background of this project design is Bad Shunting of track circuit transformation of Railway Beijing Guangzhou line stations.About the formation of track circuit pulse from the asymmetric,in-depth understanding of its structure and working principle,combining with the actual situation,analyzes and summarizes the selection of asymmetric impulse track circuit to solve many factors need to be considered in bad shunting.Not only the characteristics of asymmetric impulse track circuit with high sensitivity and strong anti-interference ability,but also in the breakdown of the semiconductor film and corrosion problem of integrated UM71 and ZPW-2000 Bad Shunting of track circuit.By the all advantages,the priority in other types of track circuit can not improve the Bad Shunting section but using the asymmetric impulse track circuit.First of all,Compared to the other track circuit,the pulse frequency asymmetry of asymmetric impulse track circuit is not easy to interference,which can adapt to China's various types of track circuit coexistence.Through the analysis of the cause of the poor shunting,combined with the characteristics of all kinds of track circuit,explaining why use the asymmetric waveform as the rail surface signal according to the characteristics of various types of shocks,track circuit,specify the asymmetric impulse track circuit respectively realize the anti-jamming ability of rail,and has better applicability.Secondly,combination with the engineering design work,how to use the asymmetric high voltage pulse track circuit to improve the reliability and timeliness of the track circuit need to be solved.Summed up a series of design principles and methods,to ensure the safe operation of the train operation risk caused by reducing bad shunting problems.Finally,the missing release of the asymmetric high voltage pulse track circuit in some special cases is presented.According to the causes of unlocking leakage,a variety of methods combined with the stage of transformation of bad shunting are discussed and compared,obtained using the RC circuit to eliminate the leakage to unlock the conclusion.The actual application shows that this scheme is feasible and has practical significance to improve the bad shunting,can also provide reference and basis for solving Bad Shunting and Missing release problem.