Abstract
The location spectrum of the existing frequencydomain reflection (FDR) method requires artificial window smoothing and is affected by spurious peaks. Therefore, this paper proposes a cable defect location method based on autoregression (AR) model. In this method, linear difference model is used to construct AR model of FDR signal instead of fast Fourier transform (FFT) to solve the problem that FFT does not satisfy the unbiased and consistent. Then the modified YuleWalker equation and the total least squares were used to calculate the parameters of the AR model, and the power spectrum of the AR model was used to accurately locate the cable soft fault. Compared with the existing FDR method, this method does not need to add window function, and can weaken the influence of spurious peak on location spectrum. Finally, the feasibility and effectiveness of the proposed method are verified by simulation.
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