Solid iron core oil-immersed transformer is a node structure more reasonable, more excellent performance and lower manufacturing cost, high reliability of power transformer products. Breakthrough products of the traditional plane type structure, with symmetrical three-phase three-dimensional structure. And because of its magnetic circuit without air gap winding more closely, silicon steel with magnetic direction and the direction of magnetic circuit is completely consistent. Three columns are arranged in an eauilateral trianale stereoscopic arrangement, a three pavilion, and the: hortest cut without waste, processing characteristics: therefore it is a use of traditional materials, but the running noise lower, more compact and efficient energy-saving transformer. In reducing the loss, saving materials onthe performance, fully in line with China's energy conservation policy.