电力变压器对称励磁涌流的仿真研究

Simulation and analysis of the inrush of power transformer

电力变压器的励磁涌流判别一直都是变压器电流差动保护的主要任务。对于电力变压器的对称励磁涌流,目前还是一个棘手的问题。应用ATP平台对三相变压器的对称励磁涌流进行仿真分析研究,得出在三相变压器Y,d联结时,适当改变系统电源电压合闸角,各相将轮流出现对称励磁涌流的情况,且对于每一项来说,合闸角不同,其对称涌流波形不同。除此之外,剩磁对对称涌流波形亦有影响。该对称励磁涌流的仿真分析研究将有助于电力变压器励磁涌流判别方法的研究。

The discrimination of the inrush of power transformer is still the main duty of the current differential protection of transformer. The symmetric inrush of power transformer is a complex problem recently. This paper simulates and analyses the symmetric inrush of three-phases transformer by the ATP. It concludes that when the transformer is the Y,d connection, according to adjusting the switch angle of the system properly there would be a symmetric inrush occuring in every phase by turns. At the same time, as to each phase, if the switch angle is different, the wave would be different. Furthermore, remanence may affect the wave as well. The simulation and analysis are helpful for the research on how to discriminate the inrush.