Experimental Research on Reliability of AC/DC Weak Current Sensors

Magneto-sensitive sensors are currently widely used in smart grids because of its wide bandwidth, high sensitivity, and small size properties. However, due to their susceptibility to environmental temperature, humidity, and magnetic field interference, long-term operation in complex environments may result in measurement failure. The range of weak currents in smart grids generally falls within the range of microamps to hundreds of milliamps. In this paper, a 0.3A current sensor was selected as the research object to study the effects of temperature, humidity, and magnetic field on its measurement performance. Accelerated aging tests were conducted under temperature, humidity, and magnetic field interference. Based on the experimental results and life prediction model, the reliability operating life of magneto-sensitive sensors under different working conditions was derived. This will provides reference data for subsequent sensor failure updates.