采用点散式测量的配电网电缆线路行波故障定位

发布时间：2018-05-24 12:56

本文选题：配电网 + 电缆　；参考：《电网技术》2014年04期

【摘要】：利用配网电缆线路便于安装同步信号采集装置的特点,提出了采用点散式测量的行波故障定位方法。基于HHT运算,定义了暂态含量系数,对各测点提取波形的残留暂态含量进行表征,按照残留暂态含量大小对测点排序。结合三端测距公式,循环替换测距三端,最终确定故障分支、区段。而后考虑D型测距原理的精度特点,选择靠近故障点且尽量对称的精确测距双端,削弱电缆严重的色散效应及多分支结构造成的波形畸变影响,重新进行精确测距。同时选取测速点实测波速,避免采用经验波速带来的误差。点散式测量可提供大量冗余数据,为测距提供了很大灵活性,极大提高了测距的成功率。经大量仿真验证,此方法精度接近离线方法,符合实际要求。
[Abstract]:Based on the characteristic that the cable line of distribution network is convenient to install synchronous signal acquisition device, a traveling wave fault location method based on point dispersion measurement is proposed. Based on the HHT operation, the transient content coefficient is defined, and the residual transient content of the extracted waveform is characterized, and the residual transient content is sorted according to the residual transient content. Combined with the three-terminal location formula, the cycle replace the three-terminal location, and finally determine the fault branch, section. Then considering the precision characteristics of D type location principle, the double ends of accurate location near fault point and as far as possible symmetry are chosen, which weakens the serious dispersion effect of cable and the influence of waveform distortion caused by multi-branch structure, and carries out accurate location again. At the same time, the measured wave velocities are selected to avoid the errors caused by the empirical wave velocities. Point-dispersion measurement can provide a lot of redundant data, which provides great flexibility for ranging and greatly improves the success rate of ranging. A large number of simulations show that the accuracy of this method is close to that of off-line method and meets the practical requirements.
【作者单位】：华北电力大学电气与电子工程学院;
【分类号】：TM762.25

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