摘要
对单相接地故障数据进行处理和分类有助于提高配电网故障状况和故障原因的诊断能力。文中采用相平面轨迹法分析单相接地故障波形数据,通过对相平面离散点按区域进行划分并统计各区域点数百分比建立了分类特征向量;采用按类间均值距离量度的分层聚类法实现了单相接地故障数据的分类。对某变电站大量实测样本进行了分类,表明所述方法分类结果合理准确。
Single phase-to-ground fault often occurs in a distribution network with its neutral point usually insulated or compensated with a coil. Processing and classification of such fault data can help expedite diagnosis and restoration to normal network condition. This paper proposes a method for classifying the phase-to-ground fault in terms of its waveform characteristics using the phase-plane method. The fault data are first characterized by the discrete points in the phase-plane domain with the phase-plane divided into three areas. Then the characteristic vector of the fault data is established by counting the percentage of discrete points in each area of the phase-plane. The hierarchical cluster algorithm is adopted to implement the classification of the fault data according to the average distance between classes. A group of field recorded fault data is classified, showing that the results obtained using the proposed method are rational and accurate.
出处
《电力系统自动化》
EI
CSCD
北大核心
2009年第8期68-71,共4页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(50877069)~~
关键词
配电网
单相接地故障
故障分类
相平面
分层聚类
distribution network
single phase to ground fault
fault classification
phase-plane
hierarchical clustering
