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小波变换作为一种新兴的理论已经在许多领域得到广泛应用，鉴于其良好的时频特性，有些文献把其应用于电力系统暂态谐波检测。文中通过分析小波函数的频域特性，阐明了将其应用于谐波检测时产生误差的根本原因，最后总结了几种典型小波的频域特性，指出现有的小波均无法实现谐波的精确测量，必须构造频城行为良好即分频严格、能量集中的小波函数，以改善检测的精度。
As a new theory, wavelet transform has been widely used in many fields. Due to its good time-frequency characteristics, some documents have been applied to power system transient harmonic detection. By analyzing the frequency-domain characteristics of the wavelet function, the paper explains the root cause of the error when it is applied to the harmonic detection. Finally, it summarizes the frequency-domain characteristics of several typical wavelets and points out that the existing wavelet can not achieve the accurate harmonic Measurement, the city must be configured to behave well that the frequency is strict, energy concentrated wavelet function to improve the detection accuracy.