An evaluation model for vacuum circuit breaker is established based on grey correlation degree and TOPSIS method

and an evaluation index system

which consists of vibration signal

vacuum density

electrical endurance and contact temperature

is proposed considering typical faults of vacuum circuit breakers. The entropy weight method is applied to determine the weights of the evaluation indexes. The Euclidean distances and grey correlation degrees are calculated to describe the closeness between the evaluating samples and the positive or negative ideal solutions

and the samples are ranked according to their calculated relative closeness. Results of data analysis for a case study show that the proposed method reflects the operating status of a vacuum circuit breaker objectively and effectively compared to other method

so it may provide a reference for maintenance planning and policy of vacuum circuit breaker.