Junli LiThis email address is being protected from spambots. You need JavaScript enabled to view it., Youpeng Zhang, and Bin Zhao
School of Automation & Electrical Engineering of Lanzhou Jiaotong University Lanzhou, 730070, China
Received: May 14, 2023 Accepted: November 4, 2023 Publication Date: December 6, 2023
Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
When the wheel leaves the insulated rail joint (IRJ) at the return current cut-off point, transient overvoltage will generate, causing arcing and burning the IRJ. Based on the basic principle of electromagnetic wave transmission, the characteristic impedance of rail line of ZPW-2000 track circuit under the effect of traction return current impact was analyzed, and the transient overvoltage was obtained. ATP-EMTP was used to model the equivalent circuit of traction return current flowing through the IRJ. The effects of compensation capacitance, wheel-rail contact resistance, rail to earth leakage, earth resistivity, and traction current phase on transient overvoltage were analyzed. Finally, the transient analysis of the two choke transformers connected through the return matching device at the return cut-off point was carried out, and protective measures to suppress the transient overvoltage were proposed. Results show that for the ZPW-2000 track circuit in the station, a inrush current and a transient overvoltage with amplitude up to 46.234kV will also be generated when the train leaves the IRJ. Although the compensation capacitance changed the characteristic impedance of the track circuit, it has no effect on the wave impedance of the rail line under the action of the inrush current and the transient overvoltage. The peak transient overvoltage was reduced by about 92.24% when the traction current phase is 90° and 270°. When the two choke transformers neutrals are connected through the return matching device, the transient overvoltage is reduced by about 90%, which had a very good overvoltage suppression effect.
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