基于波形突变的电流互感器饱和辨识

The Saturation Identification of Current Transformer Based on the Sudden Changes of Current Waveforms

电流互感器(CT)饱和是继电保护误动作的主要影响因素。在分析并仿真电流互感器典型饱和现象的基础上,运用小波变换分析电流互感器二次电流波形突变的方法,提出了基于模极大值隶属函数的有效极大值辨识方法,并利用有效模极大值准确实时地识别每个周波电流互感器二次电流过零点与进出饱和时刻,为准确辨识电流互感器的饱和区域,提供了有效的新方法。

Current transformer＇ s saturation is the most important influenced factor of power relays protection＇s mal-operation. Based on the analysis and simulation of a typical saturation phenomenon of current transformer, it used the method of wavelet transform to analyze the secondary current waveform＇s suddenly change, and addressed the method of identification of effective maximum based on the modulus maximum membership function, and utilized the effective modulus maximum to identificate weekly current transformer secondary current waveform＇s zero point and the input and output of saturation＇s time accurately and real-time. It provided a new method which can identificate current transformer＇s saturation zone.