In this paper, two type of 300mA AC/DC magnetic sensitive sensors were selected for an accelerated aging test under temperature stress. First, a temperature step test was carried out on the magnetic sensitive sensors in the range of (20~100) ℃, and then an accelerated aging test was conducted at 100℃. The difference between the changes in the AC scale factor and the DC scale factor of the two types of sensors was not significant, but the linearity of the DC scale factor of both sensors was significantly better than that of the AC scale factor at different current points. After 112 hours of acceleration at 100℃, the sensors of both samples exceeded the ±1.6% error limit, and the experimental results are of great reference value for estimating the service life of commonly used magnetic sensitive sensors in complex field environments.
Due to its excellent frequency characteristics, TMR current sensors have been widely used in current state monitoring of power systems. In order to improve the measurement performance of TMR current sensors, they are usually designed as closed-loop feedback structures. Shielding enclosures were also added to TMR current sensors to improve their antiinterference capability. This paper analysed the design parameters of the feedback coil and the shielding enclosures. The influence of position of feedback coils on TMR current sensor was also analysed. When the TMR current sensor is equipped with two layers of shielding, the influence of the size and relative distance of the two layers of shielding on the shielding effect of the TMR current sensor has been analysed. The simulation results show that the position of the feedback coil has little difference in the feedback effect of the TMR current sensor, and the anti-interference ability of the TMR current sensor can be significantly improved with a shielding layer. When the TMR current sensor has two shielding layers, the thickness of the shielding layer should be reduced as much as possible, and the distance between the two shielding layers should be appropriately extended.
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