For insulating the leakage current detection problem of equipment supply branch, researching on the application of magnetic phase modulation principle in small DC current sensor, using magnetic phase modulator achieved a feedthrough small DC current measurement. This paper describes the key points of the feedthrough small DC current sensor designs. The performance of AC excitation oscillator circuit directly determines the overall performance. The feedthrough small DC current sensor can effectively solutioned the problem of the equipment insulation leakage current detection.%针对设备供电支路绝缘漏电电流检测问题，对相位差磁调制原理在直流小电流传感器中的应用进行研究，采用相位差磁调制器工作原理实现了穿心直流小电流测量；阐述了穿心直流小电流传感器设计的关键点，交流激磁振荡电路的性能直接决定了整机的性能。穿心直流小电流传感器有效解决了设备绝缘漏电电流检测问题。
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