Coiled core transformer can effectively reduce the loss and noise of transformer operation itself, achieve energy saving in product operation, material saving in manufacturing process, and the best technical cost performance ratio, so as to meet the higher requirements of energy saving, environmental protection, low noise and other aspects put forward by the rapid economic development for transformer. At present, the three-dimensional coil iron core products benefit from its distinctive technical characteristics: they are produced from traditional silicon steel materials, and are composed of three iron cores and single frames to form a three-dimensional equilateral triangle structure. The three magnetic circuits have the same length and are the shortest; Three-phase balance, low no-load loss and low noise; Under the same conditions, about 20% of silicon steel and about 3% of copper will be saved in the manufacturing process; It is the manufacture and operation of dual-energy-saving high reliability transformer.