Electromagnetic safety on routes of multiple sections of 25 kV traction networks

Abstract

When designing and operating traction power supply systems, special attention is paid to the safety of the operation of transport power facilities and the reduction of their negative impacts on personnel and the environment. One of the determining factors of such impacts is the possibility of generating significant levels of electromagnetic fields by traction networks of electrified railways. The maximum allowable stress levels that determine the conditions of electromagnetic safety are standardized, and when the established limits are exceeded, special measures are required to be developed and implemented. In modern conditions, characterized by the large-scale use of digitalization tools, the choice of such activities should be based on computer simulation. Therefore, the development of algorithms for determining electromagnetic fields, produced by traction networks is required. To do this, digital models can be used based on methods for determining the traction power supply system modes, implemented in the Fazonord software package. Based on these models, a methodology for analyzing electromagnetic safety is implemented, which differs from the known approaches by its consistency, universality and adequacy to the external environment. The first difference lies in the possibility of calculating the electromagnetic fields based on the determination of the modes of a complex traction power supply systems in phase coordinates. The second one is achieved by the possibility of modeling traction networks of various designs: typical 25 and 2x25 kV, specialized ones, for example, equipped with reinforcing and shielding wires, as well as advanced ones, with increased voltage in the contact network. The third difference is provided by the correct consideration of the relief features, underground utilities, as well as extended metal structures located near the simulated traction networks. The article describes computer models that make it possible to analyze the conditions of electromagnetic safety on the routes of multi-track sections of railways based on the determination of the strengths of electromagnetic fields generated by traction networks. The practical use of these models will make it possible to reasonably choose measures to reduce the negative effects of electromagnetic fields on personnel, technical facilities and the environment.