A Fault Location Method for the Single-phase-to-earth Fault in Distribution System Based on the Attenuation Characteristic of Zero-mode Traveling Wave
Xu Mingming123,Xiao Liye12,Lin Liangzhen12
1. Key Laboratory of Applied Superconductivity, Chinese Academy of Sciences Beijing 100190 China; 2. Institute of Electrical Engineering, Chinese Academy of Sciences Beijing 100190 China; 3. University of Chinese Academy of Sciences Beijing 100049 China
Abstract：The zero-mode traveling wave attenuates when propagating along the cable or overhead line and the high-frequency components attenuate faster than the low-frequency components. Therefore, the ratio between the amplitudes of high-frequency component and low-frequency component decreases monotonously as the fault distance increases. A method of locating fault based on the calculation of the ratio of amplitudes of components at different frequencies is proposed in this paper. By calculating the wavelet modulus maxima of the travelling wave head at two different scales, the ratio of the wavelet modulus maxima at the two corresponding central frequencies can be obtained. After that, the ANN (Artifical Neural Networks) algorithm can be applied to establish the mapping relation between the ratio of wavelet modulus maxima at two frequencies and the ratio of amplitudes at the two frequencies. Then the ratio of amplitudes in any fault distances can be obtained. Finally, the fault distance can be calculated based on the ratio of the amplitudes of the components at the two different frequencies. Simulations based on EMTP-ATP verify the correctness of the algorithm.
徐铭铭,肖立业,林良真. 基于零模行波衰减特性的配电线路单相接地故障测距方法[J]. 电工技术学报, 2015, 30(14): 397-404.
Xu Mingming,Xiao Liye,Lin Liangzhen. A Fault Location Method for the Single-phase-to-earth Fault in Distribution System Based on the Attenuation Characteristic of Zero-mode Traveling Wave. Transactions of China Electrotechnical Society, 2015, 30(14): 397-404.
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