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中文摘要：
为克服中性点非有效接地系统中继发性故障检测困难的问题,提出了一种基于母线电压近似熵的中性点非有效接地配电网继发性故障检测方法。通过对母线三相电压进行近似熵计算,判断是否在计算时间窗内发生继发性故障,并进行继发性故障选相。所提方法仅需要电压信息,既能够识别不同线路同名相的继发性单相接地故障,也能够识别不同线路异名相的间歇性单相接地故障。首次故障与继发性故障之间的检测时间分辨率可达到毫秒级水平,大量基于ATP/EMTP的典型故障仿真结果验证了该判据的正确性。
英文摘要：
To cope with the detection difficulty of cross-country fault in non-effectively grounded distribution networks, a cross-country fault detection method is proposed, which is based on the approximate entropy of bus voltages. This method calculates the approximate entropy for bus three phase voltages, and detects whether a cross-country fault occurs during the time window. The cross-country faulted phase can also be detected. The proposed method only uses voltage information, which can not only detect the cross-country fault of the same phase with the primary fault, but also can detect the different phase intermittent fault as well. The time resolution of cross-country faults identification is of millisecond level. The correctness of the criterion is proved by ATP/EMTP typical fault simulation results. The proposed algorithm enriches the single line to ground fault detection techniques.
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