Transactions of China Electrotechnical Society  2017, Vol. 32 Issue (15): 153-160    DOI: 10.19595/j.cnki.1000-6753.tces.161806
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A Singularity Enhancement Method in Wavelet Domain for Traveling-Wave with Considering Frequency Characteristic of Line Parameter
Jia Huibin, Su Silan, Li Mingshu, Zheng Hongda
School of Electrical & Electronic Engineering North China Electric Power University Baoding 071003 China

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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.
Key wordsTraveling-wave      dispersion effect      fault location      double-ended method     
Received: 28 November 2016      Published: 18 August 2017
PACS: TM75  
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Jia Huibin
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Zheng Hongda
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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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