Research on the Determining Weight Method about the Comprehensive Assessment on Transformer State Based on Trapezoidal Fuzzy Number

Transformer is important power equipment in power system, of which the operation condition relates to the security and reliability of electric power system. The effective evaluation for transformer condition usually involves the information of multilayer, multivariable, and multi-target system, among which there are a lot of uncertainty factors, and only fully consider these uncertainty factors can get a fair result. Comprehensive evaluation method had been used more and more in the application of evaluation about the transformer´s running condition. In order to solve the comprehensive evaluation problem of the evaluation weights that are difficult to determine and include uncertainty factors with fuzzy characteristics, this paper used the analysis hierarchy process of fuzzy theory, put forward a method to determine the weight of the index system about the running condition of transformer by using trapezoidal fuzzy number, and has comparatively strong practicality in engineering.