Research on temperature rise model and installation strategy of self-heating ferromagnetic material anti-icing device

Icing on transmission lines seriously threatens the safe and stable operation of the power grid. This paper takes the LGJ-400/35 conductor as the research object, installs a sleeve-type ferromagnetic anti-icing device on its surface, and uses the alternating magnetic field generated by the current running in the conductor to cause electromagnetic loss, thereby realizing real-time online anti-icing of the conductor. Based on the mechanisms of heating, heat transfer, and anti-icing, this paper establishes a heat transfer-fluid coupling simulation model for anti-icing conductors and systematically analyzes the influence of anti-icing device length, thickness, environmental parameters, and installation strategies on conductor temperature rise. Simulation results show that under rated operating conditions, the surface temperature of the conductor with the ferromagnetic sleeve anti-icing device installed is 11.6 °C higher than that of the bare conductor. When the proportion of ferromagnetic materials is the same, the heating performance of the anti-icing device is positively correlated with its length and thickness, the surface temperature of the conductor increases significantly with the increase in current carrying capacity, and the surface temperature decreases with the decrease in ambient temperature and the increase in wind speed. By optimizing the installation and layout strategy of anti-icing devices, the effective anti-icing length can be significantly extended and the overall temperature rise level can be improved. The test results show that under typical icing conditions, no icing occurred at the anti-icing device location and the overall calculated values were close to the experimental values, verifying the effectiveness of the temperature rise model. Self-heating ferromagnetic material anti-icing devices can achieve real-time online anti-icing of conductors without relying on external energy. The optimization of their structural parameters and installation strategies is of great significance for improving anti-icing efficiency and conductor temperature uniformity.