利用磁通轨迹特征识别变压器励磁涌流

Identification of magnetizing inrush current of power transformers based on features of flux locus

提出了一种基于磁通轨迹特征的变压器励磁涌流识别方法。该方法利用实测的变压器电压和电流量来推算变压器主磁通的轨迹,通过提取主磁通轨迹的特征来判断主磁通变化范围,从而确定变压器是否发生励磁涌流。仿真和实验结果证明了识别方法的可行性。

A new method of identifying magnetizing inrush current based on features of flux locus is presented. The measured current and voltage of transformer windings are used to reconstruct the locus of main flux. Consequently,its variation range is examined whether or not within the saturation zone by extracting the flux locus features. Based on this, a new criterion for identifying inrush current is proposed. Both the EMTP simulation and experimental results demonstrate the effectiveness of the proposed discrimination algorithm.