Abstract The frequency characteristic of line parameter was analyzed in the paper, and the change law of attenuation coefficient and velocity with frequency were obtained; when the transmission distance increased, the wave front of traveling-wave would be distorted, and its singularity would decrease, which made it difficult to accurately determine the velocity and arrival time of traveling-wave, the accuracy of fault location would be reduced. Based on the propagation theory of traveling-wave, the paper proposed a singularity enhancement method in wavelet domain with considering the frequency characteristic of line parameter. The propagation coefficients of traveling-wave within a certain band were calculated by carson equation, the correction function was obtained in frequency domain, and it was used to compensate the distorted wave front of traveling-wave in wavelet domain by fast fourier transform. Thus, the dispersion effect of traveling-wave was reduced or eliminated, the singularity of traveling-wave was enhanced and the accuracy of fault location was improved. Simulation experiments illustrate that the proposed method can effectively improve the accuracy of current traveling-wave-based fault location methods.
Jia Huibin,Su Silan,Li Mingshu等. A Singularity Enhancement Method in Wavelet Domain for Traveling-Wave with Considering Frequency Characteristic of Line Parameter[J]. Transactions of China Electrotechnical Society, 2017, 32(15): 153-160.
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2017, Vol. 32 
