Andrey V. Kryukov, Konstantin V. Suslov, Dmitry A. Seredkin, Ekaterina V, Voronina

Irkutsk State Transport University, National Research University “MPEI”

The objective of the studies presented in the article was to determine the efficiency of using specialized transformers (ST) included in the contact network (CN) section and an additional return wire to reduce electromagnetic pollution at mainline railway facilities. To achieve this objective, computer models of the traction power supply system (TPS) of an AC mainline railway with a CN voltage of 25 kV were developed. The TPS was equipped with ST and additional return wires to enhance the shielding effect of the track in order to reduce electromagnetic field strengths that have a negative impact on personnel, the population and the environment. Multivariate modeling was performed to determine the efficiency of using ST. For comparison, EMF calculations were performed for a typical TPS in which ST were not used. Modeling was carried out in the Fazonord software product developed at IrGUPS and allowing one to calculate TPS modes and determine EMF of the traction network (TN) of various designs. The obtained results showed that installation of specialized transformers of relatively low power of 225 kVA, included in the section of the compressor station and additional return wire, allows to significantly improve the conditions of electromagnetic ecology. This method does not require significant capital expenditures and can be implemented on existing and planned sections of electrified railways. Computer modeling showed that this approach allows to reduce average values of intensity at a height of 1.8 meters for the electric field by 20%, and for the magnetic field - by 166%. Similar indicators for a height of 0.5 m are 20 and 190%, respectively. The physical mechanism for reducing the intensity of EMF consists in enhancing the shielding effect of the track. The approach used in solving problems of electromagnetic ecology is original and differs from known ones in the following provisions: systematicity, consisting in the ability to calculate EMF taking into account the properties and characteristics of a complex traction power system and the supply electric power system; versatility, ensuring modeling of traction networks of various designs; adequacy to the external environment, achieved by taking into account the profile of the underlying surface, underground communications, artificial structures of railway transport, such as galleries, bridges and tunnels; complexity, ensured by combining calculations of the mode and determination of the EMF strengths.

mainline railways, traction networks, electromagnetic fields, modeling