Abstract：After the single phase ground fault occurred in the resonant ground distribution network, the zero sequence impedance of the sound line shows capacitance characteristic under the circumstance that the frequency is below the minimum series resonant frequency. However, the zero sequence impedance of the faulty line presents capacitance characteristic in the high frequency and inductance characteristic in the low frequency. In terms of the phenomena above, a faulty line selection method based on zero sequence impedance characteristics of lines is proposed. The high and low frequency components of the bus zero sequence voltage and each feeder zero sequence current are extracted through low-pass and band-pass digital filters. And then the high and low frequency components of the bus zero sequence voltage are derived separately. Since the ratio between the voltage derivative and the current in the capacitive circuit is constant, the ratios between the bus zero sequence voltage derivative and the zero current of the sound line are same both in the high and the low frequencies theoretically. The actual difference of these two ratios is almost zero. Whereas, the ratios between the bus zero sequence voltage derivative and the zero current of the faulty line are different both in the high and the low frequencies, and the difference is greater. Therefore, a faulty line selection criterion is proposed. The method is proved to be accurate, reliable and adaptable through the theory and simulations.
汤涛, 黄纯, 江亚群, 罗勋华, 刘鹏辉. 基于馈线零序阻抗特性的谐振接地故障选线方法[J]. 电工技术学报, 2016, 31(20): 192-201.
Tang Tao, Huang Chun, Jiang Yaqun, Luo Xunhua, Liu Penghui. A Method of Fault Line Selection in Resonant Earthed System Based on Zero Sequence Impedance Characteristic of Lines. Transactions of China Electrotechnical Society, 2016, 31(20): 192-201.
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2016, Vol. 31 
