This paper concludes general calculative regularity of readings of two-wattmeter method using the impedanceAngle of balanced load.
本文归纳出利用对称负载的阻抗角，计算二瓦特计法表读数的一般规律。
2
Because the clamp effect of DC voltage source, AC side output the rectangular wave voltage waveform, and it has nothing to do with the load impedanceAngle.
由于直流电压源的钳位作用，交流侧输出电压波形为矩形波，并且与负载阻抗角无关。
3
Based on effect of the impedanceAngle value size in flicker calculation formula, an engineering estimation method of impedanceAngle for flicker calculation is presented in this paper.