摘要
随着变电站配网出线数目的增大,小电流接地系统单相接地故障总的次数也在逐渐增多,为了能快速有效地辨识出故障线路,首先从小电流接地系统出现单相故障后所形成电流的特征分量出发,研究了不接地和经消弧线圈接地系统的单相接地故障选线依据;并在此基础上,利用小波包变换提取故障时刻的高频分量,通过小波包系数极性选出故障线路;最后,通过仿真分析验证了选线算法的正确性。
With the growing of substations line, fault of the single-phase ground in indirectly current grounding system also increases. In order to identify the fault line quickty and efficiently, this paper firstly analyzes the characteristic components of ungrounded system and petersen-coil grounding system according to the current variation. The method of wavelet packet transform is used to select fault line of single-phase ground. High frequency components of fault time are extracted by using wavelet packet transform.The fault line is selected according to the polarity of wavelet packet coefficients. At last, the paper verifies the correctness of the line selection algorithm by the simulation analysis.
出处
《仪表技术》
2014年第9期27-30,共4页
Instrumentation Technology
关键词
特征分量
暂态高频分量
小波包变换
故障选线
characteristic component
transient high-frequency component
wavelet packet transform
fault line
