The transformer box is composed of three parts: the high-voltage chamber, the low-voltage chamber, and the transformer. The pre-assembled substation with a華style structure is mainly used in the step-up transformer boxes for new energy power generation. Its structural features differ from traditional transformer boxes in that the transformer section is placed outside the transformer box shell, effectively addressing the transformer heat dissipation issue. The transformer quickly dissipates the heat generated during operation through natural air. The transformer is tightly connected to the transformer box shell via side outgoing lines, and the transformer box is divided into the high-voltage and low-voltage chambers by partitions within the box shell, making it an ideal product for new energy power generation.