Study on Distribution Transformer Supplier Evaluation Based on Entropy

Distribution transformer is one of the key equipment in the power system. Its quality is directly related to the continuous and stable operation of the power system. At present, the distribution transformer manufacturing industry is overcapacity. The quality of distribution transformers is different strictly. It has great significance to evaluate the distribution transformer suppliers with an objective quantitative method, which contributes to purchase high-quality equipment and ensure the safe and economic operation of the power grid. There are many researches on the method of supplier evaluation, which mainly focus on the research of evaluation index or index weight. Because of the weak data base and lack of large data support, there are many subjective factors in the process of determining the evaluation process. State Grid Corporation of China (SGCC) has established the supplier database. There are more than 55 thousand suppliers in the database. In the database, there are more than 600 suppliers can produce distribution transformer, which are verified by SGCC. The high quality database enhances solid foundation for supplier evaluation. The method of distribution transformer supplier evaluation based on entropy weight method is proposed. According to the current status of power enterprise supplier management, dig into the database information. The evaluation index is divided into three levels. The first level includes 4 indexes. The second level includes 14 indexes. The third level includes 47 indexes. The evaluation indexes are comprehensive, objective and quantifiable, and the evaluation method is also objective, which avoiding subjective impact and realizing the objective quantitative evaluation of suppliers. Finally, the method is applied to distribution transformer suppliers for example analysis, which verifies the practicability of the evaluation method.