Дослідження впливу зворотного тягового струму на роботу рейкових кіл в умовах різних видів тягового навантаження

Abstract

Now the track circuits remain the main sensor of train location on the railway section and they are an element of the trains movement control systems as on a station as on the railway span. At the same time track circuits operate in a complex electromagnetic environment. The main factor of the negative influence is the power network on its work, because the rails of railway track are used to both: track circuits and return traction network. Return traction current has a negative influence on the operation of track circuits in case of rails’ asymmetry and a dangerous influence in the case of the presence in its spectrum of harmonics corresponding to the track circuits’ frequencies. Operating experience of outdoor signal devices shows that there is considerable asymmetry characteristic for most rail circuits. The spectral characteristics of return traction current scrutinized for the classic types of electric rolling stock. However, on presence day implementing a speed electric rolling stock is carried out, this locomotives have asynchronous traction motors with a voltage inverter built on IGBT-transistors. Therefore there is an urgent task for studying the spectrum of current in the return traction network at the work of different types of electric rolling stock. The analysis of work a voltage inverter is done in the paper which uses to control asynchronous traction motors. Experimental research of the spectrum composition of the return traction current generated by the different types of electric rolling stock is carried out, the increase of the noise background of the harmonic interference in rail line is shown at the implementation of speed rolling stock. The results of work can be used as a basis for the development of technical solutions to improve electromagnetic compatibility of return traction network with track circuits of railway automatics.