S13 energy-efficient three-stage oil-immersed distribution transformer is my company in the original S11 distribution transformer on the basis of the research and application of new materials， new technologies and independent innovation andt technology introduction combination of ways， through the optimization of the core and coil structure of the innovative design， to achieve the purpose of reducing the no-load loss and noise of the independent development of the product.The noise level has been reduced by 20% on average compared with the current national standard JB/T10088-2004， and the performance level of the product has reached the domestic advanced level.