The box transformer is composed of three parts: high voltage chamber, low voltage chamber and transformer. The pre-installed transformer substation with Chinese structure is mainly used in the uppressure box transformer of new energy power generation. The difference between the structural characteristics and the traditional box transformer is that the transformer part is placed outside the box transformer housing, which effectively solves the problem of transformer heat dissipation. The heat generated by the transformer operation is quickly taken away by natural air. The box is divided into high pressure chamber and low pressure chamber through the middle partition of the box transformer shell, which is an ideal product for new energy power generation.