基于相空间重构与平均电导特征的配电网单相接地故障辨识

配电网接地故障类型辨识可为故障巡线提供指导,缩短故障巡线时间。针对10 kV配电网线路的不同接地故障类型,提出基于相空间重构与平均电导特征的配电网线路故障辨识方法。通过试验采集配电网中典型接地故障的波形。针对不同介质接地故障零序电流中电弧特征,对零序电流进行相空间重构得到相平面轨迹图,计算信息维数以及吸引子面积特征,依据特征识别量将故障区分为可靠接地故障和不可靠接地故障。进一步通过计算各类型故障平均电导作为故障辨识判据,将故障区分为不同类型。试验结果表明所提方法能够有效辨识不同介质接地故障类型。

Single-phase Grounding Fault Recognition in Distribution Networks Based on Phase-space Reconstruction and Average Conductance Characteristics

Grounding fault type identification of distribution network can provide guidance for fault line inspection and shorten the time of fault line inspection. Aiming at different grounding fault types of 10 kV distribution network lines, a fault identification method based on phase-space reconstruction and average conductance characteristics is proposed. According to the arc characteristics of zero sequence current in different dielectric grounding faults, the phase plane trajectory is reconstructed by phase-space reconstruction. The information dimension and attractor area characteristics are calculated. The faults are divided into reliable grounding faults and unreliable grounding faults according to the feature recognition quantity. Furthermore, by calculating the average conductance of various types of faults as the criterion of fault identification, the faults can be divided into different types of faults. The test results show that the proposed method can effectively identify the types of grounding faults in different media.