Intro：Transformer can change the electrical net voltage into the voltagesystem or load needed, which realize electrical energy'stransit andallot. This kind of transformercan take replace of slion steel iron-coretransformer and widely used in the outdoor distribution system. Largequatity of this product put into use may save theenergy and reduceair- pollution. Which is extremely suit for the area lack of electricalenergy, big load fluctuate, dfult to maintenanoe. As the transformer adopt ominiseal structure, it can be inmotionin heavy humidity andbest for the city and rural distributionnetwork.