An Novel Technique for Accurate Measurement of Transient Fault Signal in Distribution Network Based on TMR Sensor

Aiming at the difficulty of sensing transient fault signals in a distribution network, this paper proposes a new method of accurate detection of transient fault signals in a distribution network based on tunnel magnetoresistance (TMR) chip sensors, studies the transmission characteristics of TMR sensors, and analyzes the influence law of spatial position change of sensors in the magnetic field on measurement accuracy. The optimal installation site of the new sensor is obtained, and the signal processing circuit of the traveling wave sensor is designed according to the transmission characteristics of the sensor. The simulation and experimental results show that the TMR traveling-wave sensor has the characteristics of high measurement accuracy and a wide frequency band.