The ZGSII series combined transformer is a new type of power distribution equipment developed by our company with reference to the American box transformer. The combined transformer adopts a fully enclosed, fully insulated, and full-range protection structure. The structure of components such as high-voltage load switch is optimized and the combination is perfect, while the low-voltage switchgear is as small as possible, which greatly reduces the volume of the combined transformer. Its volume is only equivalent to 1/3-1/5 of the same European-style box substation, and its cost is low, only equivalent to less than half the price of building an electric room with the same capacity, which can reach the load center to the greatest extent. At the same time, the transformer has low loss, low noise, environmental protection, high mechanical strength, and good electrical performance. Features such as strong overload capacity. It is a new generation of energy-saving and environmentally friendly products.