It breaks through the common key technologies of the transformer industry and provides an early warning for the quality control of power grid pro-ducts and the elimination of hidden danger products. At the same time, the validity of the model is verified by the actual case, and the accurate pre-diagnosis of the resistance to short-circuit capability is realized. Linear regression analysis is used to establish the regression equation, and a pre-diagnosis technique for short-circuit withstand capability of distribution transformers is proposed. The typical design process of distribution transformers is scored by experts, and the short-circuit passing rate is calculated according to the real short-circuit test data. Based on experimental big data, this paper uses the expert diagnosis method of fuzzy mathematics to establish a superior evaluation model. It has become the bottleneck restricting the engineering and industrialization development of transformer industry. The short-circuit withstand capability test of distribution transformer has the characteristics of long test period, high cost, strong destructiveness, low qualification rate, and can not be verified by simulation or calculation.

3 phase power transformer calculations