本文利用数字示波器对变压器电压电流进行了测量，通过谐波分析，讨论了电流的谐波幅值随电压非线性变化规 律，其中电流的三次谐波幅值随电压增加急剧增加，近似正比于电压的三次方，电流的偶次谐波随电压变化不显著，实验结果 与理论分析近似一致.另外通过三相变压器不同连接可获得三次谐波信号，并对三次谐波幅值随电压的变化规律进行了研究.

In this paper，both the current and the voltage in a transformer are measured by digital oscilloscope. The nonlinear relation between the current harmonic and the voltage is discussed via harmonic analysis，thereinto，the amplitude of three harmonic currents increase rapidly with the increase of the voltage，which is approximately proportional to the voltage to the third power，and the amplitude of the even harmonic current does not significant increase with the voltage. The experimental results are consistent with the theoretical analysis. In addition，three harmonic signals are obtained through different connection of winding in the three-phase transformer，and rule of the three times harmonic wave of the current changing with the voltage is studied.