【摘要】 配电线路在发生单相高阻接地故障时,由于故障特征微弱导致传统以求解电气参量为依据的选相方法存在困难。依据故障支路附加状态的三相电流中健全相与故障相存在幅值相角不一的差异,提出一种利用相空间重构方法对故障附加状态的三相电流进行升维重构,然后依据重构相轨迹图的差异作为故障特征进行单相接地故障选相的新方法。该方法可通过重构相轨迹图的差异量化指标就可以实现故障相别的准确选择,无需精确计算幅值相角。选相结果不受系统中性点运行方式、过渡电阻、故障初始相角以及负荷电流的影响。MATLAB仿真及实验结果验证了所提方法的可行性。更多还原

【Abstract】 When the single-phase high-impedance grounding fault occurs in the distribution line, the traditional phase selection method based on solving electrical parameters is difficult due to the weak fault characteristics. Based on the difference of amplitude and phase angle between the healthy phase and the fault phase in the three-phase current of the additional state of the fault branch, a new method was proposed to reconstruct the three-phase current of the additional state of the fault branch by means of phase space reconstruction in this dissertation. The accurate selection of fault phase can be realized by reconstructing the difference quantization index of phase trajectory diagram in the proposed method, without accurate calculation of amplitude phase angle. The phase selection results are not affected by the operation mode of system neutral point, transition resistance, initial fault phase angle and load current. The feasibility of the proposed method is verified by MATLAB simulation and experimental results.更多还原