The standard transformer can transform the voltage of the power grid into the voltage required by the system or load, realizing the transmission and distribution of electric energy. This transformer can replace the silicon steel core transformer and be widely used in outdoor distribution systems. The large-scale introduction of this product can achieve good energy-saving effects and reduce pollution to the atmosphere. This product is particularly suitable for areas with insufficient power and large loads, as well as areas that are difficult to maintain on a daily basis. Because the transformer adopts a full-sealed structure, the insulating oil and insulating medium are polluted by the atmosphere, so it can operate in a humid environment, which is an ideal device in the vast distribution network of cities and rural areas.