Photovoltaic power generation, as a clean energy production method, has been rapidly developed at home and abroad. Z-port S-ZG-port/port series combined transformers are precisely to meet the growing power supply requirements of photovoltaic power generation. On the basis of the company’s production of 35kV combined transformers, digest and absorb advanced technologies at home and abroad and combine domestic demand. This product is a series of products developed by installing transformers, load switches, and high-voltage fuses in the box of the transformer. The insulating oil of the transformer is used as the insulation and heat dissipation medium of the whole product. The fuel tank adopts a fully sealed structure, which has the advantages of small size, light weight, and convenient installation. Combined transformers for photovoltaic power generation are mainly divided into two types: double winding and axial double splitting. Among them, the axial double split high voltage adopts the axial segmented winding, and the low voltage adopts the copper foil winding scheme. The two branches of the low voltage can operate independently, simultaneously and in parallel, and have been widely used in photovoltaic power generation.