Journal of Electrical Engineering and Automation

High-temperature superconducting cable joints are subject to both current thermal effects and mechanical stresses during operation, and their thermo-mechanical coupling failure has become a key factor restricting engineering applications. Based on the analysis of the coupling mechanism between heat conduction and mechanical response, this study reveals the interaction laws among internal temperature rise distribution, stress concentration, and material performance degradation of the joints, and clarifies the influence of interface contact, current uniformity, and cooling conditions on the failure process. Aiming at the potential safety hazards of high-temperature superconducting joints under complex working conditions, an on-line monitoring technology scheme combining optical fiber sensing, infrared imaging, and electromagnetic signal analysis is proposed to realize real-time acquisition and state evaluation of temperature fields and stress fields. By establishing a multi-physics numerical model and an experimental verification platform, a technical system that can be used to predict failure risks, optimize joint structures, and formulate operation and maintenance strategies is formed, providing theoretical support and engineering references for the reliable operation of high-temperature superconducting power transmission projects.

High-temperature superconducting cable joint; Thermo-mechanical coupling; Failure mechanism; On-line monitoring; Multi-physics field analysis