配电网10kV线路单相接地故障定位算法方法研究

Research on location algorithm of single phase to earth fault in distribution network 10kV

针对10kV配网中常见的单相接地故障问题,结合单相故障接地特点,提出一种基于行波故障定位方法。首先,根据行波信号在波阻抗不连续点的反射规律,对高压幅值窄脉冲信号反射的故障点特征波形进行采集,并测算到故障距离;其次,利用SVM支持向量机算法对故障区域的能量波特征进行分类,从而判定故障区段。最后综合故障距离和故障区段对故障进行定位,并通过ATP仿真软件对上述方法进行验证,结果表明该定位精度高。

Aiming at the problems of single phase to ground fault in 10 kV distribution network and combining with the characteristics of single phase fault grounding,a new method based on traveling wave fault location method is proposed.First of all,according to the traveling wave signal in the reflection law of wave impedance discontinuities,collecting fault characteristic waveform of high voltage and narrow pulse signal reflection,and measure the distance to the fault; secondly,the fault characteristics of the energy wave is compared by the wavelet function,to determine the fault section.Finally,the integrated fault distance and fault section are located,and the method is verified by ATP simulation software.The result shows that the positioning accuracy is high.