（Zhongshan Power Supply Bureau of China Southern Power Grid in Guangdong, Zhongshan 528400, China）
Abstract: The traditional substation has the single-structured high-voltage chamber which lacks functions like dust prevention, heat preservation,operation environment control, equipment monitoring and so on. The paper proposes a new prefabricated-cabin type high-voltage chamber structure for the substation. The cabin and electrical equipments of this structure first can be installed and debugged in the equipment factory, and then be assembled rapidly when arriving at the site, which realizing the goal of saving construction costs and improving construction efficiency. Through adding ventilation system and air conditioning system in the closed cabin, using the thermal insulation material to produce the cabin, setting patrol robots and their running tracks in front of and behind the switch cabinet, this high-voltage chamber can have functions like dust prevention, heat preservation, operation environment control, equipment monitoring and so on. It provides not only great operation environment for power equipments, but also convenience for repair and maintenance. The application in 110 kV Tongfu station verifies the practical effectiveness of this structure.
Key words: substation; prefabricated-cabin type high-voltage chamber; double-layer structure; multifunction
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