Research on Denosing of Vibration Signal of Circuit Breaker Based on Variational Mode Decomposition and Wavelet Transform

The original vibration signal of circuit breaker contains a lot of noise, which seriously affects the extraction of signal characteristics and the judgment of the state of circuit breaker. Therefore, noise elimination is the premise of fault diagnosis of circuit breaker. In order to reduce the disturbance of noise to the circuit breaker vibration signal to the greatest extent, this paper proposes a denoising method based on variational mode decomposition (VMD) and wavelet transform. Firstly, wavelet transform is used to decompose and reconstruct the vibration signal of the circuit breaker. Then VMD decomposition was performed on the vibration signals after initial de-noising, and the effective intrinsic mode function (IMF) components were determined by the correlation coefficient criterion and reconstructed to obtain the final de-noising signal. By combining the advantages of wavelet transform and VMD, this algorithm is applied to the vibration case of circuit breaker, which can eliminate the noise and retain the useful information in the vibration signal to a great extent, and improve the precision of signal decomposition, and the result is better than the traditional signal denoising method.