基于磁场探测的直流电流测量方法研究  

Study of Measurement Technology of DC Currents Based on Magnetic Field Detection

作　　者：崔丽君 王国强 CUI Lijun;WANG Guoqiang(Harbin Institute of Technology,Shenzhen,Institute of Space Science and Applied Technology)

机构地区：[1]哈尔滨工业大学(深圳),空间科学与应用技术研究院

出　　处：《仪表技术与传感器》2024年第4期122-126,共5页Instrument Technique and Sensor

基　　金：国家自然科学基金项目(42241155);广东省基础与应用基础研究基金项目(2022A1515011698,2023A1515030132);深圳市科技计划项目(JCYJ20210324121412034);中央高校基本科研业务费专项资金项目(HIT.OCEF.2022041)。

摘　　要：通过测量磁场可间接测量电路的电流强度;为减小环境磁场对电流强度测量的干扰,基于磁通门磁强计提出了一种利用双探头测量减弱环境磁场影响的测量方案。按特定姿态把两个磁通门探头安装在合适的位置上,通过实验测试发现:2个探头磁感应强度的差值与待测电流强度呈现出很好的线性关系,通过该线性关系可由2个探头的磁场测量结果计算出待测电流强度。测试表明,该测量方案可有效消除环境磁场对电流强度测量的干扰,进一步提高电流测量精度。The current intensity of a circuit can be measured indirectly by measuring the magnetic field.In order to reduce the interference of the ambient magnetic field,a measurement scheme using two sensors was proposed to reduce the influence of the ambient magnetic field based on the fluxgate magnetometer.The two fluxgate sensors were installed in the appropriate positions according to the specific postures.Through experimental testing,it was found that the current intensity to be measured and the difference of the magnetic fields measured by the two sensors show a good linear relationship,thus the current intensity can be calculated from the magnetic field measurement results of the two sensors.The test shows that the measurement scheme can effectively eliminate the interference of the ambient magnetic field to the current intensity measurement,and is expected to further improve the accuracy of the current measurement.

关 键 词：直流电流表 磁强计 磁场 螺线管 

分 类 号：TM933[电气工程—电力电子与电力传动]