Asynchronism of ice shedding from the de‐iced conductor based on heat transfer

When overhead line is de‐iced using Joule‐effect heating, which is one of the main methods for resisting ice disasters in cold regions, the ice layer on the conductor will always be shed by section. However, the asynchoronism of ice shedding based on heat transfer is ignored in almost all ice melting models of de‐iced conductors. On the basis of an ice‐melting simulation of a three‐dimensional model of a de‐iced conductor, the effects of wind velocity and ambient temperature on the asynchoronism of ice shedding is analysed with the experimental results from a natural icing station. The influence of the two factors on the allowable current of de‐iced is also discussed. The variation of wind velocity along the de‐iced conductor is considered as the cause of the asynchoronism of ice shedding. The ice shedding rate is higher with lower wind velocity or higher ambient temperature. The relationships between the allowable current and wind velocity or ambient temperature are segmented, which could be a reference to the ice melting conducted by Joule‐effect methods.