When the transformer is loaded, heat is generated in the winding, so the oil temperature rises. As we all know, the rating of electrical equipment depends on its allowable temperature rise limit. Therefore, if the temperature rise of transformer insulating oil can be controlled, the capacity or rating of the transformer can be extended to a large range. The cooling speed of the transformer accelerates the speed of the transformer radiator. Therefore, it plays a key role in improving the load capacity of the transformer. This is the basic function of the power transformer radiato.