Discussion on Technical Solutions for Train Stopping at Overlap Section of Metro Flexible Catenary Systems

Abstract: Urban metro systems rely on flexible catenary systems, yet train stops at overlap sections pose safety risks, as highlighted by the 2022 Shanghai Metro Line 11 accident, where a stalled train caused catenary wire breakage due to kiloampere-level through-currents. This study evaluates five safety technical solutions—section insulator, load switch cabinet, de-energized section insulated overlap, anti-fusing device system, and encapsulated partial insulation—to address such risks. Through comparative analysis of safety performance, implementation complexity, cost, system compatibility, pantograph-catenary interaction, technical maturity, and maintenance, the encapsulated partial insulation solution emerges as optimal. By employing PTFE-modified U-shaped insulation sleeves on non-working contact wire supports, it physically blocks cross-currents without altering existing overlap mechanics or compromising pantograph-catenary dynamics. This approach demonstrates superior safety by eliminating transition zone arcing and overheating, lower implementation costs compared to structural modifications, and high compatibility with existing systems. Its self-lubricating PTFE reduces maintenance demands, aligning with digital monitoring trends. While PTFE’s long-term durability in metro-specific conditions requires validation, its technical maturity in other fields and innovative design position it as a transformative solution for enhancing system reliability, reducing costs, and improving passenger safety. This research provides a critical framework for metro operators and policymakers to adopt optimal safety measures, with future work recommended on accelerated aging tests and pilot deployments to standardize global implementation. Keywords: Metro flexible catenary systems, Overlap Section, Technical Solutions, PTFE. Title: Discussion on Technical Solutions for Train Stopping at Overlap Section of Metro Flexible Catenary Systems Author: Wei Wang, Wenjie Chen, Ziyan Ma, Ruigang Song International Journal of Engineering Research and Reviews ISSN 2348-697X (Online) Vol. 13, Issue 3, July 2025 - September 2025 Page No: 1-5 Research Publish Journals Website: www.researchpublish.com Published Date: 14-August-2025 DOI: https://doi.org/10.5281/zenodo.16872493 Paper Download Link (Source) https://www.researchpublish.com/papers/discussion-on-technical-solutions-for-train-stopping-at-overlap-section-of-metro-flexible-catenary-systems