Thank you very much for the comments of the reviewers. This paper uses offline monitoring. The difference between off-line monitoring and on-line monitoring is that online monitoring refers to real-time monitoring of OLTC, while offline monitoring is to sample OLTC to the laboratory for analysis. In this paper, through the laboratory in the OLTC set fault, and then four kinds of different fault vibration signals were collected 50 groups, and then feature extraction, feature selection accuracy calculation. Online monitoring is the next step of the plan, through the real-time observation of OLTC vibration conditions to extract features, compared with typical signal features, and online results are given. The whole diagnosis process is sampled from 100ms to 120ms, including the whole contact switching process of the whole M-type OLTC.<br>
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