One of the key issues of the accurate parameters analysis for the piecewise envelope current signal is to position the change point\nprecisely. Discretewavelet transform (DWT)modulusmaximamethod can detect change point, but the detection window of DWT\nwill cause suspicious change point. Besides, the amount of calculated data is very large in actual process of envelope current signal.\nTherefore, in this paper, the envelope is used instead of the original sampling data for DWT so as to reduce the calculation amount.\nWhat is more, combined with the sliding dislocation window method, the change point can be located accurately and the pseudochange\npoint can be eliminated. The simulation results as well as the electric locomotive current and forging machine current\nexamples show that it is feasible to detect the change point precisely through the proposed method, which provides possibilities for\nreal-time online monitoring of change point.
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