Consideration of the influence of supports in modeling the electromagnetic fields of 25 kV traction networks under emergency conditions

• Published in: Global Energy Interconnection Vol. 7; no. 4; pp. 528 - 540
• Main Authors: Suslov, Konstantin, Kryukov, Andrey, Voronina, Ekaterina, Ilyushin, Pavel
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2024; Department of Power Supply and Electrical Engineering,Irkutsk National Research Technical University,Irkutsk 664074,Russia%Department of Power Supply and Electrical Engineering,Irkutsk National Research Technical University,Irkutsk 664074,Russia; Department of Hydropower and Renewable Energy,National Research University,Moscow Power Engineering Institute,Moscow 11250,Russia; Department of Transport Electric Power,Irkutsk State Transport University,Irkutsk 664074,Russia%Department of Transport Electric Power,Irkutsk State Transport University,Irkutsk 664074,Russia%Department of Research on the Relationship between Energy and the Economy,Energy Research Institute of the Russian Academy of Sciences,Moscow 117186,Russia; KeAi Communications Co., Ltd
• Subjects: AC railways; Electromagnetic fields near supports; Electromagnetic safety; Emergency conditions; Modeling; Power supply systems; Power supply systems; AC railways; Modeling; Electromagnetic safety; Electromagnetic fields near supports; Emergency conditions
• ISSN: 2096-5117; 2590-0358
• DOI: 10.1016/j.gloei.2024.08.004

Single-phase 25 kV traction networks of electrified alternating current (AC) railways create electromagnetic fields (EMFs) with significant levels of intensity. The most intense magnetic fields occur when short circuits exist between the contact wire and rails or ground. Despite the short duration of exposure, they can adversely affect electronic devices and induce significant voltages in adjacent power lines, which is dangerous for operating personnel. Although numerous investigations have focused on modeling the EMF of traction networks and power lines, the challenge of determining the three-dimensional electromagnetic fields near metal supports during the flow of a short-circuit current through them is yet to be resolved. In this case, the field has a complex spatial structure that significantly complicates the calculations of intensities. This study proposes a methodology, algorithms, software, and digital models for determining the EMF in the described emergency scenarios. During the modeling process, the objects being studied were represented by segments of thin wires to analyze the distribution of the electric charge and calculate the intensities of the electric and magnetic fields. This approach was implemented in the Fazonord software, and the modeling results show a substantial increase in EMF levels close to the support, with a noticeable decrease in the levels as the distance from it increases. The procedure implemented in the commercial software Fazonord is universal and can be used to determine electromagnetic fields at any electrical power facility that includes live parts of limited length. Based on the proposed procedure, the EMF near the supports of overhead power lines and traction networks of various designs could be determined, the EMF levels at substations can be calculated, and the influence of metal structures located near traction networks, such as pedestrian crossings at railway stations, can be considered.