摘要
根据小电流接地系统发生单相接地故障时,暂态零序容性电流特征频段内故障线路暂态零序电流相位与非故障线路相反,提出了利用复小波变换提取该特征频段内相位信息,同时对特征频段内小波变换域进行了能量最大化选择的选线算法。通过在MATLAB中仿真分析验证,该算法不受过渡电阻、合闸角的影响,能够正确选择出故障线路。
Based on single-phase malfunction in low current grounded system, the transient zero-sequence capacitive current of faulty line in character frequency range is just the reverse of that in non-faulty line, extracting the phase information in character frequency range using complex wavelet transform was proposed. Meantime, the selection of maximization energy of wavelet transform was made. The emulation and analysis in MATLAB prove that this algorithm is not influenced by the transition resistance, and the close angle, and it can select the faulty line accurately.
出处
《电测与仪表》
北大核心
2009年第12期70-73,共4页
Electrical Measurement & Instrumentation
关键词
小电流接地
特征频段
复小波变换
相位信息
能量最大化
选线
low current grounded, character frequency range, complex wavelet transform, phase information, maximization energy, line selection
