Abstract
In order to improve the stability and reliability of transmission lines, this paper investigates the growth process and surface discharge characteristics of icicles on outdoor insulator strings under DC voltages. In a charged icing experiment in an artificial cold room, the growth process of the maximum icicle lengths at different shed edges were recorded and measured by using a high-speed camera, and the influence of DC surface discharges on the icicle growth was investigated. Under DC voltages, the icicles finally attain a stable length. However, the growth rate of icicles is faster under positive DC voltage than that under negative DC voltage. The simulation analysis shows that the velocity field and temperature field of surface discharge towards the tip of icicles are higher under positive DC voltage than those under negative DC voltage. Under negative DC voltages, more air gaps and accumulated charges from discharge activities were discovered on the ice-covered insulator threads at the end of the experiment.
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