Thermodynamic Performance and Lifetime Prediction Model of High-Voltage Transmission Lines in High Temperature and High Humidity Environments

With the intensification of global climate change, extreme weather events are becoming more frequent, and the thermodynamic performance and fatigue life of high-voltage transmission lines in high-temperature and high-humidity environments are increasingly drawing attention.High-temperature and high-humidity conditions have a complex impact on the thermal stress and material fatigue of transmission lines, potentially reducing the reliability and service life of the power grid.To address this issue, this paper proposes a thermodynamic analysis-based model for calculating thermal stress and predicting fatigue life of high-voltage transmission lines under high-temperature and high-humidity conditions.The study first provides a detailed analysis of the thermal stress in transmission lines under high-temperature and high-humidity conditions, revealing the impact of temperature and humidity variations on the thermal expansion and deformation of the lines.Subsequently, combining material fatigue theory, the paper establishes a fatigue life prediction model for the lines, quantifying the accumulation process of fatigue damage under the influence of thermal stress.Through this theoretical model, the paper aims to provide a scientific basis for the design, evaluation, and maintenance of high-voltage transmission lines in harsh environments, ensuring the stability and safety of the power system.