基于行波信号注入的配网线路单相故障状态接地诊断方法

A Single Phase Grounding Fault State Diagnosis Method for Distribution Network Lines Based on Traveling Wave Signal Injection

配电网线路运行维护过程中,由于单相接地故障特征波识别方式的差异,使得线路单相接地故障诊断的准确率较低,无法满足电力系统工作需求。提出基于行波信号注入的配网线路单相接地故障状态诊断方法。通过故障录波装置获取故障特征数据,构建故障波形特征库;采用高压脉冲信号源作为行波信号注入源,并分析脉冲源控制回路;根据行波信号反射结果,应用小波变换算法识别线路故障特征波;根据特征提取结果,计算特征空间的欧式距离,完成配网线路单相接地故障状态诊断。实验结果表明:与当前诊断方法相比,所提方法既有效提高了单相接地故障诊断的准确率,又提升了电网线路故障诊断的整体水平。

During the operation and maintenance of distribution network lines,the difference of characteristic wave identification methods lowers the accuracy of line single-phase grounding fault diagnosis,which fails to meet the working needs of the power system.To this end,a single-phase grounding fault diagnosis method based on traveling wave signal injection is proposed in this paper.The fault characteristic data is obtained through the fault recording device,and the fault waveform characteristic database is constructed.The high voltage pulse signal source is used as the traveling wave signal injection source,and the control loop of the pulse source is analyzed.According to the reflection result of the traveling wave signal,the wavelet transform algorithm is used to identify the line fault characteristic wave.According to the feature extraction results,the Euclidean distance of the feature space is calculated to complete the single-phase grounding fault state diagnosis of distribution network lines.The experimental results show that compared with the current diagnosis methods,the fault diagnosis accuracy of the proposed method is improved by 16%and 28%,which greatly improves the fault diagnosis level of power grid lines.