YB □ -40.5 series wind power box-type substation (hereinafter referred to as box-type transformer) is a kind of special equipment that increases the voltage of wind turbine from 0.6~ 0.69kV to 35kV and connects it to the grid for output. Different from the traditional box-type substation, the high-voltage load switch, fuse, high-voltage components, transformer body and non-excitation tap-changer are sealed in the same oil chamber, and the structure is compact. Flexible installation of switchgear on the low-voltage side This product is used in various wind power generation sites and is the best supporting product for wind power generation systems.