A Wide Range Current Sensing Device Based on Tunnel Junction Magnetoresistance Sensor for Power Transmission Line Monitoring

According to the monitoring requirements of the transmission line, an online monitoring scheme of the operation state of the transmission line based on the TMR current sensor is proposed. The solution has the ability to measure steady-state current and transient current. A sensing unit circuit for measuring transmission line current is designed. Experiments show that this method can effectively monitor the current state of the transmission line, and provides an effective technical means and necessary reference for understanding the operating state and faults of the transmission line and the power grid.