When the on load tap changer fails, the amplitude and frequency of the fault vibration signal will change. Therefore, on the basis of VMD decomposition, the energy distribution of the fault vibration signal is determined by calculating the IMF of each eigenmode component. A series of IMF components can be obtained by VMD decomposition of bearing vibration signals. Each mode component X of ceemd decomposition contains different frequency components of bearing vibration signals and has different energy a, forming bearing vibration<br>The energy distribution of signal in frequency domain. Therefore, the formula of ceemd energy entropy can be expressed<br>In the form of<br>
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