CAJ | 학술논문

变压器在空载合闸过程中会产生励磁涌流，此时电流可达到额定电流的4～8倍，会给系统带来冲击，同时也会使变压器差动保护发生误动，因此，研究变压器励磁涌流具有非常重要的意义。利用MATLAB/simulink搭建了变压器仿真模型，分别对影响变压器励磁涌流的因素和励磁涌流的特征进行了仿真研究。仿真结果表明，变压器剩磁和合闸角是影响励磁涌流的主要因素；变压器励磁涌流时，电流会出现间断角，并含有大量的非周期分量和二次谐波分量，并给出了不同涌流程度下间断角和谐波含量的变化规律。
변압기재공재합갑과정중회산생려자용류，차시전류가체도액정전류적4～8배，회급계통대래충격，동시야회사변압기차동보호발생오동，인차，연구변압기려자용류구유비상중요적의의。이용MATLAB/simulink탑건료변압기방진모형，분별대영향변압기려자용류적인소화려자용류적특정진행료방진연구。방진결과표명，변압기잉자화합갑각시영향려자용류적주요인소；변압기려자용류시，전류회출현간단각，병함유대량적비주기분량화이차해파분량，병급출료불동용류정도하간단각화해파함량적변화규률。
The transformer will produce an excitation inrush current in the case of no-load switching-in, and the current can reach 4~8 times to rated current .It will impact for the power system ,and the differ-ential protection of transformer may happen to be tripped in non fault .Therefore, the study of transformer inrush current has extremely vital significance .The paper constructs the transformer model based on the MATLAB/simulink,and discussed the condition and the characteristic of excitation current .The result in-dicates that the conditions of excitation current are remanence and voltage ,and the dead angle will appear in the current and the current will contain a large number of harmonic and aperiodic component .The paper points out the variation regularity of the dead angle and harmonic content in different level of inrush cur -rent.