We provide a review of the status and challenges for utilizing magnetic tunneling junction (MTJ) based magnetic sensors for power grid applications. We show that, with both modeling and experimental measurement, an optimized MTJ-based magnetic sensor can be utilized to monitor grid current, especially for individual grid lines. From the perspective of the sensor, the sensitivity, signal-to-noise ratio, and linearity can all meet the needs in the field. Unlike traditional measurements, this measurement can be based on a contactless or “remote” sensing setup, where the sensor is placed away from the grid line. One of the challenges is that a complex topology and multiple grid lines may exist with different current levels. The other challenge is that, with the improved sensing capability provided by these MTJ sensors, a significantly larger amount of data can be collected, so the system bottleneck shifts from sensing to data transfer.

中文翻译：

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用于电网应用的基于 MTJ 的磁性传感器的实际挑战

我们回顾了将基于磁隧道结 (MTJ) 的磁传感器用于电网应用的现状和挑战。我们表明，通过建模和实验测量，优化的基于 MTJ 的磁传感器可用于监测电网电流，尤其是单个电网线。从传感器的角度来看，灵敏度、信噪比、线性度都可以满足现场的需要。与传统测量不同，这种测量可以基于非接触式或“远程”传感设置，其中传感器放置在远离网格线的位置。挑战之一是复杂的拓扑结构和多条电网线可能存在不同的电流水平。另一个挑战是，随着这些 MTJ 传感器提供的改进的传感能力，