Transient Temperature Distribution of Cable Insulation Layer and Finite Element Analysis

To address the limitations of existing technologies in cable temperature rise monitoring and early warning systems, this paper presents an advanced analytical method that provides accurate cable temperature monitoring and early warning mechanisms for power systems. First, we established a transient temperature model of the cable insulation layer to accurately predict its radial temperature distribution at any given time. The temperature evolution of the insulation layer over time was then calculated using the finite element method. The effectiveness of the proposed model was verified through simulated temperature rise tests at different current levels. Simulation results indicate that the model can accurately simulate the temporal variation of cable temperature under specific current and environmental conditions. Additionally, it precisely models the radial temperature distribution of the cable, identifying hotspot locations. This model not only elucidates the dynamic relationship between current and insulation characteristics but also provides a basis for cable hot spot warnings. Its practical application can effectively prevent cable overheating damage, demonstrating significant practical value.