Simulation model of electromagnetic compatibility of neighboring infrastructure facilities on lines with heavy trains traffic

The continuous increase of traffic and traction loads cause the increase of loads on power supply infrastructure that leads to the growth of levels of electromagnetic emission. It results in the growth of probability of emergency functioning of overhead system because of which currents achieve very high levels that may lead to serious accidents in related circuits of signalling and remote control facilities. Such accidents often cause different failures affecting the quality and safety of railway traffic, they lead to equipment damages, as well be a reason for fire. The strongest contribution to the total number of accidents with cable lines is made by electromagnetic influence in case of heavy train movement. And as the result of such train passing along the lines with failed grounding a cable is burnt through. The requirements for EMC of infrastructure facilities are getting stricter, including the requirements for reliability and information security of communication and signalling systems. Existing methods used to define induced currents and voltages do not take into account loads that occur in today’s volume of traffic, and do not allow to define the dependence on the parameters of grounding of infrastructure facilities. The parameters of lateral facilities are not taken into account as well. These facilities are located along the track on the whole length of railways. Besides, the grounding parameters change in the course of heavy train moving in different areas. That has become very important to simulate electromagnetic processes in multi-wire systems with consideration of inherent and mutual parameters of lines, as well as ground parameters. But mathematical models of electromagnetic compatibility on railway transport due to its complexity do not always help to obtain the numerical values of induced currents and voltages in the communication circuits and signalling. This article describes an application method of simulation modeling that helps to define the levels of induced currents and voltages in the lateral lines of communication and signalling on the sections of heavy train movement. The paper offers the procedure of simulation modeling, simulation results for a line of heavy train movement and the analysis of the impact of grounding parameters on induced voltages. The simulation results were correlated with the experiment data and admitted to be consistent. The calculations made by the suggested procedure helped to reveal the key dependences of induced currents and voltages on ground parameters, as well as nonlinear dependencies of the induced voltage on ground resistance that forms the basis for further studies and correlation of the obtained data with the statistics accumulated during operation.

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