基于C型行波法的配电网故障定位的实用研究

提出了利用C型行波法在配电网中进行故障定位的方法。该方法分两步进行,第一步定出故障距离,第二步定出故障分支。在线路始端注入高幅值窄脉冲并检测从线路返回的波形,比较进行自适应滤波后正常和故障两种情况下的波形,得到故障距离。提出行波传输的特征波的概念。通过分析故障录波的特征波,来确定故障分支。将故障测距和故障分支结果结合起来达到精确定位。通过理论分析、ATP仿真及现场实验,并对所得数据进行有效分析,证明了该方法的正确性,也说明该方法在配电网故障定位中是实际可行的。

Study on fault location in distribution network based on C-type travelling-wave scheme

A method based on C-type traveling-wave scheme for fault location in distribution network is put forward.There are two steps in this method.The first step is fault distance determination,and the second step is fault branch determination.Via injecting a signal with high voltage and narrow pulse,wave back from the lines is monitored.Comparing the normal and fault waveforms after adaptive filter,fault distance is calculated.The definition of feature-waveform in traveling-wave is brought out.Fault branch is fixed after analyzing the feature-wave of fault waveform.The results of the two steps make fault location accurately.After theoretical analysis,ATP simulation,experiments on spot and effective data analysis,this method is proved to be correct and practical.