封闭母线具有良好的电气和力学性能,随着发电机容量增加,自冷封闭母线截面尺寸过于庞大。如国外60万千瓦发电机组采用的自冷封闭母线,外壳和导体的直径分别达到1.6米和0.8米以上。这不仅使有色金属消耗量增加,占地面积过多,而且在制造、安装和厂房布置等方面带来一系列困难。一般认为电流在14,000安培以上采用风冷的封闭母线才是经济的。 Closed busbar has good electrical and mechanical properties, as the generator capacity increases, the self-cooled closed busbar section size is too large. Such as foreign 600,000 kilowatts of generating units used in self-enclosed cold bus, the shell and the conductor diameter of 1.6 meters and 0.8 meters respectively. This not only increases the consumption of non-ferrous metals and covers an excessive area, but also presents a series of difficulties in manufacturing, installation and plant layout. It is generally considered economical to use an air-cooled enclosed busbar above 14,000 amperes.