【摘要】 对利用小波提取小电流接地系统的故障暂态信息进行故障选线的方法作了深入细致的分析研究 ,以能更充分提取电力系统故障暂态信号的奇异性所包含的丰富特征信息为出发点 ,提出了一种新的基于小波变换模极大值奇异性检测理论的选线新方法 ,该方法对暂态电气量进行小波分解 ,选取特征量突出的第三尺度模极大值信息作为选线判据 理论分析及仿真实验表明 :该选线方法适合各种接地方式的小电流接地系统 ,可准确、可靠的实现单相接地故障选线更多还原

【Abstract】 On the basis of farther research about abstracting transient fault information to detect fault line in neutral indirectly grounded systems, a novel fault line identifying principle based on the theory of signal singularity detection with the wavelet transform modulus maxima is presented in this paper, which can acquire abundant characteristic information from transient fault signal more detailedly. The dyadic wavelet transform is used to decompose the transient electrical quantities, and the distinct information of modulus maxima in the third scale is abstracted to compose a new criterion. Theoretical analysis and lots of simulation show that the proposed method can reliably and exactly detect the fault line in single phase to earth fault and it is suitable for various distribution systems with different neural grounding modes.更多还原