YB Kou-12 series prefabricated substations have the characteristics of strong completeness, small size, compact structure, safe and reliable operation, convenient maintenance, and mobility. Compared with conventional civil substations, box type substations of the same capacity usually occupy only 1/10 to 1/5 of the conventional substations, greatly reducing the design and construction workload and construction costs. In the distribution system, it can be used for ring network distribution systems, as well as for dual power or radiation terminal distribution systems. It is a new type of complete equipment for the construction and renovation of urban and rural substations.