Multi-Mode Chain De-icing Model and Conductor Jump Height Study for High Drop Transmission Lines

Transmission line ice covering and de-icing is one of the important factors that threaten the safe operation of the power grid, and the de-icing mode of the conductor has a great influence on the jump height caused by its de-icing. In order to prevent the power system from tripping and other faults due to the small insulation gap of the conductor-ground line, it is necessary to accurately assess the jump height of the conductor de-icing, so as to rationally plan the line defense measures and reduce the risk of line failure. In this paper, the finite element method is used to analyze the de-icing jump height of transmission lines. Through the construction of different height difference ratio of the “insulator string - three files” line model, analysis of the middle file in the uniform de-icing, high chain de-icing and low chain de-icing and other different de-icing conditions of the conductor de-icing dynamic response, and explore in the conductor high chain de-icing conditions, file distance, ice thickness, de-icing rate, height difference ratio and other parameters of the conductor jumping height. The results show that: when the de-icing rate decreases, the jump height of the wire de-icing decreases accordingly, and the height decay rate of the chain de-icing is lower than that of the uniform de-icing; the jump height of the wire de-icing increases with the increase of the number of gears, the gear distance, the thickness of the ice cover, and the de-icing rate; the jump height of the wire de-icing decreases as the ratio of the intermediate gear height difference increases.