The state detection of power cables is very important to ensure the reliability of the power supply. Traditional sensors are mostly based on electric field detection. The operation is complex, and its efficiency needs to be improved. This paper optimizes the design and development of the magnetic field detection sensor for AC power cables. First, through the establishment of the magnetic field sensor model, it is determined that permalloy is the material of the magnetic core, the optimal aspect ratio of the magnetic core is 20, and the ratio of coil length to core length is 0.3. Second, the coil-simulation model is established, and it is determined that the optimal number of turns of the coil is 11,000 turns, the diameter of the enameled copper wire is 0.08 mm, and the equivalent magnetic field noise of the sensor is 0.06 pT. Finally, the amplifying circuit based on negative magnetic flux feedback is designed, the sensor is assembled, and the experimental circuit is built for the sensitivity test. The results show that the sensitivity of the magnetic field sensor is 327.6 mV/μT. The sensor designed in this paper has the advantages of small size, high sensitivity, ease of carry, and high reliability.

中文翻译：

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交流电力电缆磁场检测传感器的优化设计与开发

电力电缆的状态检测对于保证供电的可靠性非常重要。传统传感器大多基于电场检测。操作复杂，效率有待提高。本文对交流电力电缆磁场检测传感器进行了优化设计和开发。首先，通过磁场传感器模型的建立，确定坡莫合金为磁芯材料，磁芯最佳长径比为20，线圈长度与磁芯长度之比为0.3。其次，建立线圈仿真模型，确定最佳线圈匝数为11000匝，漆包铜线直径为0.08mm，传感器等效磁场噪声为0.06pT 。最后设计了基于负磁通反馈的放大电路，组装了传感器，搭建了实验电路进行灵敏度测试。结果表明，磁场传感器的灵敏度为327.6 mV/μT。本文设计的传感器具有体积小、灵敏度高、便于携带、可靠性高等优点。