基于差分磁场技术的铜排电流测量方法研究  

Research on Busbar Current Measurement Method Based on Differential Magnetic Field Technology

作　　者：胡珩 李国祝 金恺[1] 黄光明[1] 李高翔[1] 杨国卿 HU Heng;LI Guo-zhu;JIN Kai;HUANG Guang-ming;LI Gao-xiang;YANG Guo-qing(College of Physical Science and Technology,Central China Normal University,Wuhan 430079,China;Hangzhou Dianzi University,Hangzhou 310018,China)

机构地区：[1]华中师范大学物理科学与技术学院,湖北武汉430079 [2]杭州电子科技大学,浙江杭州310018

出　　处：《仪表技术与传感器》2022年第5期88-92,共5页Instrument Technique and Sensor

摘　　要：高精度磁传感器应用于铜排电流测量时往往会受到量程的制约,差分磁场技术为铜排电流测量提供了一种新的方法。在输电铜排的中心处打孔以形成差分磁场,差分形式使得大电流产生的磁场强度大幅度衰减,因此量程受限的磁传感器可以拥有更大的电流测量范围。利用一对高灵敏度磁通门传感器芯片对差分磁场进行测量,部分抑制了来自外部的杂散磁场。使用有限元法对铜排的磁场分布进行了仿真分析,在此基础上设计了传感器样机并进行测试与实验研究。系统测试与结果分析表明,传感器样机在1 kA量程内相对误差优于1.5%,全量程测量精度可达0.8%。测试结果验证了测量方案的可行性与实用性。The application of high-precision magnetic sensor in busbar current measurement is often limited by the measurement range.Differential magnetic field technology provides a new method for busbar current measurement.A hole was drilled in the center of the busbar to form a differential magnetic field and the differential form caused the magnetic field generated by a large current to decrease substantially.The magnetic sensor with limited range had a larger current measurement range.A pair of high sensitivity fluxgate sensor chips was used to measure the differential magnetic field,which partially suppressed the stray magnetic field from the outside.The magnetic field distribution of busbar was simulated and analyzed by finite element method.On this basis,the sensor prototype was designed,tested and experimentally studied.The system test and result analysis show that the relative error of the sensor prototype is better than 1.5%in the range of 1 kA,and the full range measurement accuracy can reach 0.8%.The test results verify the feasibility and practicability of the measurement scheme.

关 键 词：差分磁场 大电流检测 磁通门传感器 磁感应强度 宽量程 抗干扰 

分 类 号：TM933[电气工程—电力电子与电力传动]