【摘要】 提出了一种基于小波变换的无通道全线速动行波保护。它利用小波变换提取行波信号 ,利用阻波器对行波波头的平滑作用 ,通过计算初始行波波头的平缓程度判断故障是在区内还是在区外 :当波头非常陡时 ,判断为内部故障 ;当波头比较平滑时 ,判断为外部故障。理论分析和实际系统的EMTP仿真表明了该原理是正确、可行的。更多还原

【Abstract】 Inceptive travelling wave is smoothed when it passes through the line trap.Based on the variation difference of inceptive travelling waves between internal and external faults,a wavelet and travelling wave based non- com munication high speed transm ission line protection is described in this paper.Steep inceptive wave means the internal faults while flatinceptive wave indicates the external faults.Wavelet transform is used to pick up travelling wave com ponent and determine the tim e when the sharpest variation appears. Theoretical analysis and EMTP sim ulation have proved the correction and feasibility of this principle.更多还原