Power transformer condition assessment based on improved evidential reasoning

Condition assessment is the foundation of condition based maintenance of power transformers. On the basis of rational partition of transformer condition and uncertainty of condition assessment indices, an operation condition assessment model and an improved evidential reasoning (ER) assessment approach for the transformer are presented. The initial basic probability assignment of evidence is accessed by means of analytic hierarchy process (AHP) and fuzzy evaluation method. The newly approved method is applied to the case of conflicting evidence. The results of an example analysis test its effectiveness.