ZGS11-Z• D series buried transformer was tested by the National Transformer Testing Center in September 2003. Its special test, type test, IP68 protection grade test and other indicators all meet the relevant national standards, and passed the identification of provincial new products and the acceptance of power departments. The product has been gradually put on the market since 2004. Main features: 1. Suitable for urban environment (installed in basement or cellar), especially for densely populated central cities; 2. Lighting and power system suitable for streets, highways, bridges, tunnels, parking lots, airports, ports, tourist attractions, etc; 3. High and low voltage incoming and outgoing lines adopt waterproof, fully sealed, fully insulated and fully shielded wiring mode; 4. The box shell is made of anti-corrosion stainless steel, fully sealed and can be immersed in water for a period of time; 5. The protection system shall fully consider the convenience and safety of operation, and the accessories shall be Cooper products of the United States; 6. The buried transformer is operated by operating rod, which has the same operation mode as the combined transformer; 7. Considering the particularity of heat dissipation conditions, the transformer adopts low loss and low temperature design; 8. Waterproof entry protection and automatic drainage measures shall be installed in the transformer cellar.