【摘要】 针对牵引网目前广泛应用的故障测距算法易受整次、非整次谐波、机车负荷以及线路参数波动的影响,提出一种利用线路单端暂态电压进行精确故障测距的新算法。通过理论分析得到测量段等效阻抗的谐振频率与故障暂态电压、电流频谱极大值频率相对应的结论。进一步根据测量端等效阻抗的谐振频率与故障距离相对应的关系建立测距公式,采用频域法分析故障暂态信号在高频段的频率特性,实现精确测距。通过EMTDC仿真验证,该算法基本不受过渡电阻、机车及线路参数小范围波动等因素的影响,测距结果准确且鲁棒性强,具有较高的工程应用价值。更多还原

【Abstract】 To solve the problem that accuracy of traditional fault location algorithm for traction networks is affected by integer, non-integer harmonics, electric locomotive and fluctuation of traction line’s parameters, a novel fault location algorithm is presented which uses fault-generated transient voltages measured at single terminal. The theory analysis demonstrates that the resonance frequencies of the equivalent impedance and the frequencies versus amplitude spectrum maximum of transient voltages and currents are the same. So it determines fault distance by analyzing frequency characteristic of transient voltages measured at one-terminal of the system based on the definite relationship between resonance frequency of the equivalent impedance and fault distance. The digital simulation using EMTDC shows the algorithm is accurate, reliable and not affected by fault resistance, locomotive operation and variation of line parameter. So it is highly valuable for practical engineering.更多还原