Transformer can change the electrical net voltage into the vottage system or loadneeded. which realize electri-cal energ, stransitand allot. This kind of transformer-can take replace of silicon steel iron-core trans-fonner and widely used in the outdoor distributionsystem. Large quatity of this product put into usemay save theenergy and reduce air-pollution. Wnich is extremely suit for the area lack ofelectrical energy.big load fluctuate. difficult to maintenance. As the transformer adopt ominiseal structlJre it can bein motion in heavy humidity and best for the city and rural distribution network.