Abstract：In order to improve the accuracy and reliability of single-phase grounding fault feeder selection in distribution network, a fault line selection method based on traveling wave panoramic waveform in time-frequency domain is proposed. First, the S-transform is used to extract the time-frequency traveling wave panoramic waveform of each line, which can display truly the characteristics of the fault traveling. The difference of amplitude, frequency and polarity of traveling wave between faulty line and healthy line is analyzed in detail. Then, based on the principle of waveform similarity, the traveling wave panoramic waveform of faulty line and healthy lines are analyzed quantitatively, and a similarity degree coefficient matrix is constructed for each line. By calculating the sum of the correlation coefficients of each line, the difference of the panoramic waveform is amplified, and the accurate distribution network line selection is realized. The proposed faulty line selection method does not need to set the threshold manually. A large number of simulation results show that the method has high algorithm adaptability. Under 3kΩ high-resistance ground fault, it can still achieve sensitively faulty feeder selection in distribution network.
邓丰, 梅龙军, 唐欣, 徐帆, 曾祥君. 基于时频域行波全景波形的配电网故障选线方法[J]. 电工技术学报, 2021, 36(13): 2861-2870.
Deng Feng, Mei Longjun, Tang Xin, Xu Fan, Zeng Xiangjun. Faulty Line Selection Method of Distribution Network Based on Time-Frequency Traveling Wave Panoramic Waveform. Transactions of China Electrotechnical Society, 2021, 36(13): 2861-2870.
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