基于Matlab软件的变压器空载励磁电流仿真

摘要

电力系统产生暂时工频过电压时空载变压器产生的大幅值励磁电流会损坏变压器的绝缘,因此变压器的励磁电流特性值得深入研究。利用变压器的Jiles-Atherton磁滞模型,基于Matlab软件对变压器空载励磁电流仿真,得到了在不同过电压水平下变压器空载励磁电流波形。对一台11 kV变压器算例仿真显示,所得到的波形与实际情况相符合。%The temporary frequency overvoltage occurred in power systems could lead to a high amplitude excitation current that may damage the insulation of transformers,and thus the excitation current characteristics of transformers is worth to research.Based on Jiles-Atherton hysteresis model of transformers,this paper makes simulations on the no-load excitation current of transformers with Matlab software,and obtains the excitation current waveforms on various levels of voltage.The simulation results of an 11 kV transformer,as an example,are consistent with the reality.