Abstract:In order to diagnose the mechanical fault of transformer on‐load tap‐changer (OLTC) effectively, a fault diagnosis method based on improved variational mode decomposition (VMD) and relative density‐based outlier score (RDOS) is proposed. Firstly, the signal is decomposed into a series of modal components with narrow band and distinguishing centre frequency by improved VMD based on optimal quality factor. Then, the energy, permutation entropy, power spectrum concentration degree and characteristic frequency of … Show more
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