This series is comprehensive power distribution equipment developed based on transformer. It is a transformer added with high-voltage load switch, fuse, tap switch and other standard components. Low-voltage measurement and compensation may also be provided upon request. It is similar to compact substation functionally and saves the user’s effort in designing power distribution substation as well as designing and calculating complicated short-circuit current, dynamic thermal stability, and relay protection. With the features of small size, low price, low loss, low noise, reliable power supply, protective function equipment, rational structure, flexible installation, easy operation, and the possibility of access to load center, it is widely applied to city network construction as well as high-rise, residential community, industrial park, business center, airport and wharf, school, factory, mine and other enterprise and power distribution site.