Transformer Substation, also known as a Pre-Installed Substation or Pre-Assembled Substation, is a compact indoor/outdoor power distribution unit consisting of high-voltage switchgear, distribution transformers, and low-voltage distribution equipment, all integrated according to wiring schemes. It combines transformer step-down and low-voltage distribution functions organically, housed in a moisture-proof, rust-proof, dust-proof, rodent-proof, fire-resistant, theft-proof, insulated, fully enclosed, and mobile steel structure box. Particularly suitable for urban grid construction and renovation, it represents a new type of substation that has emerged after traditional civil engineering substations. The Transformer Substation is applicable to mines, industrial enterprises, oil and gas fields, and wind power stations, replacing the original civil engineering power distribution rooms and substations to become a new type of complete set of transformer and distribution equipment.