In engineering applications

case-based reasoning is one of the important means of equipment failure analysis.When the traditional case retrieval technology is applied to the transformer failure analysis

the problem that the retrieval result is not ideal due to the lack of data will occur.This paper presents a transformer fault case retrieval method based on set pair analysis.This paper use contact number in the set pair analysis as the similarity between cases

with the case-level weight of the index

to solve this problem.On the one hand

it takes into account the changes of indicator weight under different failure modes;on the other hand

it solves the problem that the case similarity is comparable under the insufficient data

and non-uniform weights.Example analysis result shows that the proposed method is more effective in the diagnosis of transformer fault diagnosis.