Improvement of the method of determining dangerous voltage in adjacent lines of communication under magnetic influence of a tracing AC system

Ilya A. Terekhin, Ivan A. Kremlev, Igor V. Tarabin, Erbol G. Abishov
2020 Transportation systems and technology  
Currently, there are obstacles on the railways of the Russian Federation for the widespread introduction of a new method of grounding the contact network supports, namely, there is no theoretical and experimental assessment of the electromagnetic effect of the AC traction network on adjacent communication lines when using the contact network supports as natural grounding conductors. Aim: Improving the methodology for determining hazardous voltage in adjacent communication lines under the
more » ... es under the magnetic influence of the AC traction network. Methods: The article discusses the magnetic effect with two fundamentally different grounding systems for AC contact poles - a traditional grounding system on a traction rail network and a system without grounding a contact network poles on a rail network (using fittings and foundations of contact network poles as natural grounding conductors). Results: The paper shows the disadvantage of the existing methodology for calculating the dangerous voltage in cable lines under magnetic influence, which has a number of serious assumptions that do not allow an objective picture of the magnetic effect on adjacent lines in the presence of a group ground wire. Based on the existing methodology, an improved mathematical model has been developed that allows one to determine the specified values of the dangerous voltage in adjacent communication lines by taking into account the actual length of the group ground cable during operation of the traction network without grounding the supports on the traction rail network. The obtained values of hazardous influences are compared with standard values in the short circuit mode and forced mode. An assessment of the magnetic effect on adjacent communication lines with a traditional grounding system and a system without grounding the supports of the contact network to the traction rail network is given. Conclusions: The magnetic effect of the traction power supply system of alternating current using poles as natural grounding conductors is less than when using the grounding system of poles of a contact network on a rail network.
doi:10.17816/transsyst20206192-103 fatcat:5vms3je4m5al3hmtgksikk32au