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近年来迅速发展起来的小波变换分析方法，具有多尺度（分辨）分析和时—频局部化特性，特别适用于边缘和峰值突变信号的处理和特征抽取。为了满足变压器微机保护可靠性、快速性的要求，使保护在励磁涌流期间可靠闭锁，把小波变换应用于变压器差动保护的间断角测量，探讨了用小波变换局部极大值测量间断角的新方法。计算机仿真表明，该方法算法简单、抗干扰能力强、测量精度高，可降低间断角微机保护的成本，有助于加速变压器差动保护微机化的进程。
In recent years, the rapid development of wavelet transform analysis method with multi-scale (resolution) analysis and time-frequency localization characteristics, especially for edge and peak abrupt signal processing and feature extraction. In order to meet the reliability and rapidity requirements of microcomputer protection of transformers, the protection is reliably blocked during the inrush current. The wavelet transform is applied to the interruptive angle measurement of transformer differential protection, and the new method of measuring the discontinuity angle by wavelet transform local maxima method. Computer simulation shows that this method has the advantages of simple algorithm, strong anti-interference ability and high measuring precision, which can reduce the cost of microcomputer protection for discontinuity angle and accelerate the process of microprocessor-based differential protection of transformer.