A Prefabricated Transformer Substation, also known as a box-type substation or compact substation, is a highly integrated modular power distribution solution that integrates high-voltage switchgear, distribution transformers, low-voltage distribution equipment, and intelligent monitoring systems into a single weatherproof enclosure. All core components are pre-designed, assembled, and strictly tested in the factory, then transported to the site as a whole or in modules for rapid installation. It serves as a key intermediate link in power transmission and transformation, converting high-voltage electricity into low-voltage electricity that meets the needs of end users, and is widely used in modern power grid construction, urban infrastructure, industrial and commercial fields, and renewable energy projects. Compared with traditional civil-construction substations, it breaks through the limitations of on-site construction, featuring compact structure, rapid deployment, energy conservation, and high reliability, becoming an indispensable core equipment for efficient and flexible power supply. It complies with international standards such as IEC 60076, IEC 62271-202, ANSI, and domestic standards including GB/T 17467-1998, DL/T 537-1993.