Nonlinear Current Detection Based on Magnetic Modulation Technology

This paper proposes a sensor for leakage-current detection based on the magnetic modulation technology. The sensor can measure both nonlinear current with an arbitrary waveform and linear current from dc to several kilohertz. The current sensor consists of only one magnetic core and one winding, which significantly reduces the sensor size. The structure and operating principle of the current sensor are introduced, and the dynamic process of the current sensor is analyzed. In addition, the mathematical model of dynamic process with hysteresis considered for the current sensor is presented. Both the simulation and the experimental results are presented to verify the effectiveness of proposed current sensor.