基于波形奇异性特征检测电流互感器铁心饱和的新方法

结合铁心磁化曲线特点分析电流互感器铁心饱和的物理过程，得到了铁心饱和开始及结束时，电流互感器二次侧感应电压和电流波形的奇异性特征：感应电压的模值及二次回路功率因数较高时二次电流的模值在饱和开始时骤降，在饱和结束时骤升；感应电压和电流的高阶差分会出现模极大值串。由此，提出一种新的铁心饱和检测方法。该方法具有运算量小、便于实时实现等特点。仿真和实验表明，该方法有效、实用。

New Current Transformer Saturation Detecting Method Based on Singularity Characteristics of Waveforms

By analyzing the physical process of current transformer saturation, this paper presents the singularity characteristics of waveforms of current transformer secondary current and induction voltage. First, when saturation begins, the module of induction voltage abruptly decreases and, when it ends, the module abruptly increases. Secondly, module extrema will appear on the high-order difference of current transformer secondary current and induction voltage when saturation begins and ends. Based on this, a new current transformer saturation detecting method is proposed that detects saturation by combining those singularity characteristics. The method needs little computation and is suitable for real-time implementation. It is shown by simulation and experiment that this method is effective and practical.