摘要
分析了电力变压器铁芯产生剩磁的原因及其特点。通过对变压器有剩磁和无剩磁两种情况对比分析,指出励磁电流的偶次谐波是剩磁存在的标志。并提出通过对励磁电流偶次谐波的测量来判断变压器有无剩磁的检测方法,现场试验和EMTP软件仿真验证了该检测方法的可行性。
This paper analyzes the reason and its characteristics of generating residual magnetism in transformer iron core. Through the comparative analysis of two situations in having residual magnetism and having no residual magnetism, it is found that the even harmonic of excitation current is a sign of existing residual magnetism. The paper also puts forward the detection method to determine whether there is residual magnetism in the transformer by measuring the even harmonic of excitation current. The feasibility of the method is verified by field experiment and EMTP software simulation.
出处
《陕西电力》
2009年第10期58-61,共4页
Shanxi Electric Power
关键词
电力变压器
剩磁
励磁电流
偶次谐波
power transformer
residual magnetism
excitation current
even harmonic
