南方电网500kV交流输电线路防雷策略及外绝缘合理配置方案研究

Research on Anti-lightning Strategy and External Optimization Configuration Principle of 500kV AC Transmission Line in China Southern Power Grid

针对南方电网500kV交流输电线路故障特点,对几种典型的防雷措施(减小地线保护角、加强线路绝缘水平、降低接地电阻)从适用范围、效果和经济性等方面进行了分析。对不同类型的绝缘子进行了长串人工污秽试验研究,并采用饱和等值盐密法提出了南方电网500kV交流输电线路外绝缘配置原则;并对不同外绝缘配置方案进行了技术经济比较,推荐了线路外绝缘优化配置方案。

Aiming at accident character of 500 kV AC transmission line of Southern Grid of China, analyzing different typical strategy of anti-lightning stroke （reducing angle of ground wire protection, increasing insulation level of transmission line, reducing earth resistance） including scope of application, effect and economical efficiency. Basing on artificial contamination test data of different type long string insulators, presents external insulation configuration principle of 500 kV AC transmission line applying saturated salt concentration measurement. Furthermore, compare technicality and economy of different external insulation configuration principle, and recommend optimization configuration principle of transmission line.