Taking into account the train schedule when modeling the electromagnetic effects of traction networks on pipelines

Abstract

In recent years, it has become possible to connect high-mass trains by means of a virtual coupling, which does not imply their mechanical coupling; however, when moving, the distance between the trains is kept constant. This distance is determined taking into account the mass of trains, stopping distance, realized speeds, as well as other factors and is assumed to be equal to 1500 … 2000 meters. When using a mechanical coupling, the connected trains run at a distance of 5…6 km. The article presents the results of computer studies aimed at studying the influence of virtual coupling technologies on the levels of induced stresses that occur on the pipeline ground laying due to the electromagnetic influence of traction networks. To solve this problem, the methods developed in IrGUPS for modeling the modes of traction power supply systems were used, which were based on multiphase models of elements of electric power systems implemented in the Fazonord software package. When forming the models, the harmonic distortions of the traction network voltages and currents, as well as the distribution of parameters, were taken into account. The simulation is carried out in relation to the power supply scheme of a mainline railway with a 25 kV traction network. Two ways of forming heavy trains were considered: mechanical coupling and virtual coupling. The simulation results showed that when using a virtual coupling, the average values of the resulting induced stresses calculated for individual points of the pipeline, taking into account harmonic distortions, are reduced by 35…124 %. The proposed methodology and the developed computer models can be used in practice to ensure the electrical safety of personnel working on pipelines that are located near the main railways.