A Self-powered Wireless Inrush Current Measurement System

A self-powered inrush current measurement system based on the electromagnetic induction principle is proposed. Signal coil and power harvesting coil adopt Rogowski coils, which are nested in the current channel. Power supply unit draw out energy from inrush current. After signal conditioning, polarity, peak value and occurrence time of transient surge current can be acquired. The current information can be power-down stored, and wireless data transmission is achieved through ZigBee protocol. Experiments prove that the system can be self-powered by inrush current and realize linear measurement within the range of 10kA to 200kA.