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介绍小波变换定义、性质和时间尺度分析，研究小波变换的尺度谱检测无噪声和有噪声条件下的行波暂态信号的能力．通过检测尺度谱图的峰值实现对行波暂态信号的检测．对三种小波变换的尺度谱和参数选择进行仿真和比较后表明，选择好合适的小波和参数，即使在较低的信噪比条件下也有相当好的检测效果．与只用小波变换检测相比，尺度谱图法检测表现更好，适应性更强．
The definition, properties and time scale analysis of wavelet transform are introduced. The scale spectrum of wavelet transform is used to test the ability of traveling wave transient signal under noiseless and noisy conditions. The detection of the transient signal of traveling wave is realized by detecting the peak of the scale spectrum. After the simulation and comparison of the scale spectrum and the parameter selection of the three wavelet transforms, it is shown that the suitable wavelet and parameters are selected, and the detection result is good even under the low signal-to-noise ratio. Compared with the wavelet transform only, the scale spectrum method performs better and has more adaptability.