| 基于波形相似度的配网小电流接地故障选线技术研究 |
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| 引用本文：吴建辉,刘伟,康国庆,郭帅,李恒宇.基于波形相似度的配网小电流接地故障选线技术研究[J].电网与清洁能源,2020,36(8):38~42 |
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| 基金项目:国网河南省电力公司科技项目资助（5217B017001F） |
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| 中文摘要:针对配网小电流接地故障选线准确性差的问题，该文在波形相似度理论基础上，研究了配网小电流接地故障选线技术。分析配网小电流接地故障高频分量、电流工作频率的变化量和非线性电阻产生的高频分量，给出了故障线路和非故障线路的暂态直流分量方向，在此基础上，利用暂态零序列电流波形伸缩变换选线原理判断小电流接地故障线路。通过模糊K均值聚类选线方法进行接地故障电路选线，设计矩阵隶属线路的隶属度，根据计算结果给出选线结果及流程。选择一个具有6条线路的接地系统进行实验，结果表明，当小电流接地电弧线圈的单相接地故障表现为间断性电流分量故障时，利用所研究的技术进行配网小电流接地故障选线的准确性高、可靠性好。 |
| 中文关键词:波形相似度 配网小电流 接地故障 选线技术 |
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| Research on Line Selection Technology of Distribution Network with Small Current and Ground Fault Based on Waveform Similarity |
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| Abstract:To address the poor accuracy of the line selection for small current grounding faults in the distribution network， this paper studies the line selection technology for small current grounding fault in the distribution network on the basis of waveform similarity theory. The high frequency component of small current grounding faults， the variation of the current working frequency and the high frequency component of nonlinear resistance in the distribution network are analyzed， and the direction of the transient dc component of the fault line and the non-fault line is given. On this basis， the transient zero-sequence current waveform stretching transformation principle is used to judge the fault line of small current grounding. The fuzzy k-means clustering method is used to select the grounding fault line， and the membership degree of the membership matrix is designed. The line selection results and flow chart are given according to the calculation results. And a six-circuit grounding system is selected for the experiment. The results show that when the single-phase grounding fault of the small current grounding arc coil appears as the fault of the intermittent current component， the fault line selection of the small current grounding fault in the distribution network using the proposed technology is of high accuracy and reliability. |
| keywords:waveform similarity distribution network small current ground fault line selection technology |
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