ZBW1-12 Series Combined Substation is researched and developed by our company in order to satisfy the need of city net construction. It has compact structure, strong whole set, safe and reliable operation, convenient maintenance, beautiful appearance. It is widely used in outdoor power supply fields such as high buildings, residential zone, station, wharf, port, park, marketplace, factory and mining, etc. The product can not only be used in a closing net for power distribution but also in radial grid for terminal power supply. The product has novel structure, reliable performance, excellent in quality and technical characteristic reach to the national advanced level. The product firstly passes the appraisal from Mechanic-electrical Department and Energy Department in our country in 1991, the performance reachs the national advanced level.