500 kV超高压输电线路负荷交流融冰研究

Study on AC Ice Melting of 500 kV EHV Transmission Lines

输电线路融冰方法的研究对提升输电线路运行可靠性具有重要意义。首先,基于热传学分析了负荷交流融冰热力学特征,建立了500 kV架空输电线路JLHA3-425铝绞线覆冰模型。然后,仿真分析了施加融冰负荷电流时覆冰导线温度分布,获取了了风速、环境温度、冰层厚度对融冰电流和融冰时间的影响,并通过安双5375和安岭5376超高压线路的实际融冰,验证了所提方法的可行性与有效性,有助于进一步提升架空输电线路融冰技术的发展与推广。

The study on ice melting methods is of significance to improving the reliability of transmission lines.In this paper,the thermodynamic characteristics of AC ice-melting were analyzed based on the heat transfer theory,and a simulation model of ice-coated aluminum stranded wire used on JLHA3-425 overhead transmission line was established.Through simulations,the temperature distribution of the iced-coated wire under the ice melting current was analyzed,and the effects of wind velocity,ambient temperature and ice thickness on the ice melting current and ice melting time were obtained.In addition,the feasibility and effectiveness of the proposed method were verified by the practice of Anshuang 5375 and Anling 5376 EHV transmission lines,which is helpful in further promoting the development and popularization of ice melting technology for overhead transmission lines.