【摘要】 分析了三相工频不平衡电路的暂态过程，提出了电流的直流分量中存在两个衰减系数不同的直流分量的概念。并分析了这两个直流分量随合闸相角变化而变化的规律，指出了它们对测量功率因数的影响。更多还原

【Abstract】 The article analyses the transient state of the unbalanced three-phase circuit on industial frequency and puts forward the concept that there are two direct current components with different attenuation coefficients. It also analyses. The varying law of them according to the phase at the intant the switch is closed, and points out how they affect the measurement of the power factor.更多还原