中文摘要：

输电线路发生故障后的信号是一个突变的、具有奇异性的暂态信号，包含着丰富的故障信息。输电线路的破坏多半是由短路故障引起的，通过分析短路故障，采用db5小波对故障后的电压信号进行检测。依据实际电力系统输电线路进行短路故障实例仿真，仿真结果表明db5小波可以快速而准确地检测输电线路短路故障信号的奇异点，从而为下一步故障测距提供有利依据。

英文摘要：

Post fault signal of the transmission line is a transient signal with singularity, boasting rich information of the fault. Most of the faults are caused by short circuit of the lines, which are studied in this paper. The post fault voltage signal is analyzed with dh5 wavelet. Simulation of the real short circuit fault of transmission lines shows that the dh5 wavelet can detect the singularity of the fault signal fast and accurately, which helps to locate the fault in the next step.