基于小波分析的变压器励磁涌流研究

针对小波变换原理可有效分析非线性、非平稳信号局部特征的优点,在研究电力变压器励磁涌流作用机理的基础上,考虑到二次谐波制动原理条件下变压器差动保护存在误动作的可能性,提出了一种运用小波变换模极大值理论实现励磁涌流与故障电流的识别。借助于仿真结果,论证了该试验方法对电力变压器进行差动保护的现实可行性。

Study on the Magnetizing Inrush Current of Transformer Based on Wavelet Analysis

Aiming at the advantage of wavelet transform principle which can effectively analyze the partial feather of nonlinear and non-steady signals,considering malfunction possibility of power transformer differential protection under second harmonic restraining principle based on studying the function of transformer magnetizing inrush current,put forwards a wavelet transform modulus maximum method to distinguish magnetizing inrush current and inner fault current.As well as simulation results demonstrate that the experimental method to enable the practical feasibility for differential protection of power transformer.