工程科学与技术2024，Vol.56Issue(2)：37-44,8.DOI:10.15961/j.jsuese.202300149
基于环路积分型磁阻传感阵列的电流测量方法
Current Measurement Method Utilizing Loop-Integral Magnetoresistance Array
摘要
Abstract
The power system serves as a crucial infrastructure for daily human activities and represents one of the most intricate artificial systems.To ensure the stable and reliable operation of the power system,precise and dependable state monitoring becomes imperative.Varied state monit-oring scenarios necessitate distinct measurement methods to obtain more accurate results.Currently,online monitoring of current within the power system primarily focuses on wire current measurement in indoor locations,leaving a gap in measurement methods for the working current of cop-per bars in the power system.In addressing the need for monitoring the current of the power system busbar,the utilization of the magnetic field as the coupling method demands attention to resolving two key problems:1)Developing a magnetic field model for rectangular cross-section copper busbars with current flow;2)Creating a magnetic field measurement and current inversion method based on the magnetic field of the copper bus-bar with current flow.This paper,based on Biot Savart's law,establishes an ideal magnetic field model for copper busbars with current flow.The study delves into the magnetic fields of rectangular cross-section copper bars in both near and far fields.Through magnetic field calculations,the impact of the number of measurement units within the current sensor array on current measurement is explored,and the array structure is optim-ized.Employing Ampere's loop law and a mean algorithm,the error between the array current back-calculation result and the given current is de-termined.Building upon this,a design is proposed,encompassing a rectangular array,a measurement information processing module,a data path,and associated hardware circuits for measuring current in a rectangular copper busbar.A unique double-layer circuit board structure is employed to secure and position multiple tunnel junction magnetoresistive effect sensing units.Ultimately,an experimental platform,utilizing electrified copper bars,is established to measure the current of a copper busbar under laboratory conditions using the array measurement system.Experi-mental results demonstrate that the current measurement array outlined in this paper achieves an accuracy of less than 1%.关键词
电流测量/磁阻传感器/阵列/测量系统Key words
current measurement/tunnel junction magnetoresistive sensor/array/measurement system分类
信息技术与安全科学引用本文复制引用
刘舒,毕然,赵文凯,马浩宇,柳劲松,胡军..基于环路积分型磁阻传感阵列的电流测量方法[J].工程科学与技术,2024,56(2):37-44,8.基金项目
国家杰出青年科学基金项目(52125703) （52125703）
国网上海市电力公司科技项目(52094021N00B) （52094021N00B）
