The three-phase oilimmersed distributing transformer applies new type insulatingstructure and makesshort-circuit resistance strong The iron core is made of high-qualitycold-rolled silicon-steel plate. High-voltagewinding group is made up of high-qualitoxygen-free copper lines and it adopts multilayered drum typet sructure. Al fastenershave been processed with special treatment to prevent them from loosening. As high-tech product that promoted by the country, the product has manyadvantages such as high efficiency, low loss. Its social benefits are remarkable that it willsave much of electricity consumption and operating cost.