三芯电缆非侵入式多导体电流测量研究  

Research on non-invasive multi conductor current measurementof three-core cables

作　　者：高干 文玉梅[1] 李平[1] Gao Gan;Wen Yumei;Li Ping(School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240

出　　处：《仪器仪表学报》2024年第4期127-135,共9页Chinese Journal of Scientific Instrument

基　　金：国家重点研发计划(2022YFB3205703)项目资助。

摘　　要：针对当前的三芯电缆电流测量直接使用传感信号进行多导体位置和电流的测量,传感器数量未确定,使用数量多不仅使多导体电流测量系统没有确定的传感器使用策略,而且导致测量误差大的问题,本文分析给出了非侵入测量三芯电缆电流所需的最少且最优的磁传感器数量,提出了非侵入式多导体电流测量原理。根据三芯电缆电流传导环电缆磁场分布关系,使用6个磁传感器环绕电缆分布,由每个传感信号获取2个特征值的最优估计,建立12个独立方程,实现电缆中导体位置的检测和导体电流的测量。搭建了三芯电缆电流测量平台,进行了测试验证。测试结果表明,该方法测量15~100 A的三相电流的振幅最大误差小于1.00%,相角误差小于2°,导体位置误差小于0.2 mm。提出的测量原理极大减小了多芯电缆电流的在线测量误差,且测量系统拥有更简单的结构和精准的位置及电流波形测量结果。In response to the current situation where the current measurement of three core cables directly uses sensing signals to measure the position and current of multiple conductors,the number of sensors is uncertain and the number of sensors used is large.This not only makes the multi-conductor current measurement system lack a determined sensor usage strategy but also leads to large measurement errors.This article analyzes and provides the minimum and optimal number of magnetic sensors required for the non-invasive measurement of three-core cable current.The principle of non-invasive multi-conductor current measurement is proposed.Based on the magnetic field distribution relationship of the three-core cable current,6 magnetic sensors are used to surround the cable distribution.The optimal estimation of 2 eigenvalues is obtained from each sensing signal,and 12 independent equations are established to achieve the detection of conductor position and measurement of conductor current in the cable.A three-core cable current measurement platform was built and tested for verification.The test results show that the maximum amplitude error of the method for measuring three-phase currents ranging from 15 to 100 A is less than 1.00%,the phase angle error is less than 2°,and the conductor position error is less than 0.2 mm.The proposed measurement principle greatly reduces the online measurement error of multi-core cable current,and the measurement system has a simpler structure and accurate position and current waveform measurement results.

关 键 词：多导体电流测量 隧道磁阻传感器 传感器阵列 相关检测 

分 类 号：TH89[机械工程—仪器科学与技术] TM933[机械工程—精密仪器及机械]