数字式高精度智能电流传感器设计  

Design of Digital High Precision Intelligent Current Sensor

作　　者：王越 李立伟 刘含筱 WANG Yue;LI Li-wei;LIU Han-xiao(College of Electrical Engineering,Qingdao University,Qingdao 266071,China;Weihai Innovation Institute,QingdaoUniversity,Weihai 264200,China;College of Control Science and Engineering,Shandong University,Jinan 250061,China)

机构地区：[1]青岛大学电气工程学院,山东青岛266071 [2]青岛大学威海创新研究院,山东威海264200 [3]山东大学控制科学与工程学院,山东济南250061

出　　处：《仪表技术与传感器》2022年第5期10-14,共5页Instrument Technique and Sensor

基　　金：山东省重点研发计划项目(2017GGX50114)。

摘　　要：为了提高电流互感器的精度和接入计量、保护系统的重用性,设计了一种数字式智能电流传感器。在传统电磁式互感器中集成采样单元、微处理器、光纤同步单元、光纤通讯单元,以IEC61850-9-2以太网通信协议输出数字量信号供外部设备使用。并利用最小二乘法进行传感器校准,解决了电磁式互感器全电流比差线性度差的问题。通过实验表明,传感器输出稳定,精度高,全电流范围内比差不超过0.02%。In order to improve the accuracy of current transformer and reuse of access measurement and protection system,a digital intelligent current sensor was designed.In the traditional electromagnetic transformer,the sampling unit,microprocessor,optical fiber synchronization unit and optical fiber communication unit were integrated,and the digital signal was output by IEC61850-9-2 Ethernet communication protocol for external equipment.The least square method was used to calibrate the sensor,which solved the problem of poor linearity of total current ratio difference of electromagnetic transformer.Experiments show that the sensor has stable output and high precision,and the specific difference in the full current range is no more than 0.02%.。

关 键 词：电流互感器 光纤通讯 IEC61850-9-2 最小二乘法 

分 类 号：TM932[电气工程—电力电子与电力传动]