Analysis of Ice-Covering Characteristics of China Hunan Power Grid

Ice-covering characteristics are often researched in transportation, communication, and electric power industry. China Hunan Power Grid can easily suffer from ice disaster because of its geographical and climate environment. In particular, in the 2008 ice disaster, icing on overhead transmission lines and facilities caused outage in some cities and counties with a total population of about 30 million people. The ice-covering characteristics of the China Hunan Power Grid were analyzed in this paper. The recorded icing and frost climate data were investigated and analyzed. The model of overhead power line icing was proposed. The ice accretion mechanism was thus revealed. The icing impact factors such as geographical situation, climate characteristics, freezing weather characteristics, microterrain, and elevation were also presented in detail. The necessary conditions for ice-covering formation and the glaze frost distribution of Hunan Province were obtained.