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介绍了数学形态滤波的基本原理与形态滤波器的构建。针对油纸绝缘典型局部放电故障模型的局部放电信号的分析问题,提出一种基于开、闭运算的级联组合数学形态滤波器的新方法。通过将数学形态滤波器用于复杂局部放电信号中的脉冲干扰的实例分析,说明该方法对局部放电信号的干扰噪声有很好的滤波效果,实现了高频信号无时滞、无相移的滤波处理,表明数学形态滤波对分析局部放电脉冲信号有很好的应用前景。
The basic principle of mathematical morphology filtering and the construction of morphological filter are introduced. Aiming at the problem of PD signal analysis in the typical partial discharge fault model of oil-paper insulation, a new method of cascade combined mathematical morphology filter based on open and close operations is proposed. The mathematical morphology filter is applied to the example analysis of impulsive interference in complex partial discharge signals, which shows that this method has a good filtering effect on the interference noise of the partial discharge signal and realizes the filtering without phase delay and high frequency of the high frequency signal It shows that the mathematical morphology filter has a good application prospect for the analysis of partial discharge pulse signal.