Abstract
The PURPOSE of the study is development of methods and tools for modeling electromagnetic fields when passing a tractive network in artificial constructions of railway transport. METHODS. The study employs the methods for determining the modes of traction power supply systems (TPSS) using phase coordinates, which are based on the models of elements in the form of lattice equivalent circuits with a fully-meshed topology. These models and methods are implemented in the program complex Fazonord providing simulation of the TPSS modes of different types as well as determination of strengths of an electromagnetic field created by tractive networks of these traction power supply systems. When calculating the strengths the elements of artificial constructions have been simulated by the sets of grounded wires. RESULTS. The article presents the simulation results of electromagnetic safety conditions in the traction networks on the sections of railroads located in artificial constructions including galleries, bridges, tunnels. The metal work of these structures significantly affects a distribution pattern of electromagnetic field strengths in space. This fact is explained by the presence of the grounded conducting objects (which transform the tunnels, galleries and bottom-road bridges into limited spaces) and remoteness of the Earth's surface when moving on the deck-type bridges. CONCLUSION. The simulation results of electromagnetic fields in the engineering structures of railway transport show that at the height of 1.8 m from railroad tracks the deck-type bridge has the greatest electric and magnetic fields the strengths of which are higher than in the open space. The tunnel, gallery and the bottom-road bridge are characterized by smaller strengths and lower flows of electromagnetic energy, which is due to the closeness of the screening metal works of these constructions to the catenary system. The energy is transferred by an electromagnetic field in tunnels, on galleries and bottom-road bridges in a limited space between the catenary system and grounded constructions located nearby.
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