Leakage Current of Milliampere Level Measurement Scheme Based on TMR Sensor

This paper proposes a measurement scheme for leakage current in power systems. The scheme is based on a tunneling magnetoresistance (TMR) sensor, and related circuits and shielding devices are designed. Taking the application of lightning arrester leakage current measurement as an example, a scheme for monitoring the condition of lightning arrester based on lightning arrester leakage current measurement is proposed. The experiment shows that the seal paper based on TMR can measure leakage current and realize online monitoring of lightning arrester status.