电力变压器励磁涌流仿真计算的瞬时功率法

本文提出一种基于变压器铁芯材料的基本磁化曲线Ｂ＝ｆ（Ｈ）、变压器铁芯的几何尺寸、空载损耗数值及瞬时功率的概念，对变压器空载合闸时，在各种不同的合闸角及各种不同剩磁的情况下所产生的励磁涌流进行计算的新方法。通过对计算结果的分析，得出励磁涌流的特征，如峰值、波形及间断角的大小同剩磁和合闸角的关系等。本文所提出的方法有助于对电力变压器设计的正确性进行校验及变压器保护的研究。

SIMULATING CALCULATION METHOD OF MAGNETIZING INRUSH CURRENT OF POWER TRANSFORMERS USING CONCEPT OF INSTANTANEOUS POWER

Only using the normal magnetizing curve (B-H curve) of the material for transformer core, its geometric dimensions, the no-load power loss data and the conception of instantaneous power, a new simulating method is presented in this paper. It enables to calculate the magnetizing inrush current occurring in case of switching on no-load transformer at different switching angles and different remanent flux. Based on the calculated results, such characteristics of the magnetizing inrush current are analyzed as the relationship of magnitude, waveform, discontinuous angle with respect to remanent flux and switching angles, etc. At last, the result of simulating calculation using EMTP for the same transformer is compared with that obtained by the method presented in this paper and the result of comparison shows that this method is helpful for verifying the correctness of power transformer design and for the research of new transformer protection principle, e. g., applying the neural network to transformer protection, etc.