一种高准确度电子补偿式电流比较仪  

A high accuracy current comparator with electronic compensation

作　　者：李鹤[1] Enrico Mohns 雷民[1] 赵伟[3] 章述汉[1] 胡浩亮[1] Li He Enrico Mohns Lei Min Zhao Wei Zhang Shuhan Hu Haoliang(China Electric Power Research Institute, Wuhan 430074, China Physikalisch-Technische Bundesanstalt, Braunschweig D-38116, Germany State Key Laboratory of Power System, Tsinghua University, Beijing 100084, China)

机构地区：[1]中国电力科学研究院,武汉430074 [2]德国物理技术研究院,德国布伦瑞克d38116 [3]清华大学电力系统国家重点实验室,北京100084

出　　处：《电测与仪表》2017年第19期96-101,共6页Electrical Measurement & Instrumentation

基　　金：国家电网公司纵向科技项目(JL-71-15-048)

摘　　要：电流互感器(CT)被广泛应用于电流的比例变换,但其准确度一般难以优于0.01%。具有更高准确度的电流比例变换装置,例如双级电流互感器或补偿式电流比较仪,由于使用上的限制,一般只用于工频电流比例的量值溯源或量值传递。针对于此,研发出一种利用电子线路补偿铁心励磁电流的即所谓电子补偿式电流比较仪(ECCC)。文中阐述这种电流比较仪的基本原理,理论分析其误差性能,并进行了误差校准试验。试验结果表明,该ECCC的准确度满足0.000 5级要求,既可作为一种高准确度的电流比例标准,也可用于工频电流的高准确度测量。Current transformer （CT） has been widely used in current ratio transformation. Normally, its accuracy hardly exceeds 0. 01%. Some more accurate current ratio transformer devices, such as two-stage current transformer and compensated current comparator, can only be used in the traceability or distribution area of current ratio quantity of power frequency due to some limitations. In view of this situation, a current eomparator with electronic compensa- tion （ECCC） using electronic circuit to compensate the magnetizing current of the core was developed. The principle, theoretical analysis of the error, and the calibration tests are presented in the paper. The results showed that the EC- CC fulfills the requirements of the accuracy class of 0. 000 5. It can be used either as a high accuracy current ratio standard, or a normal CT in power frequency current measurement where high accuracy is needed.

关 键 词：电流互感器 电流比较仪 电流比例 校准 误差 高准确度 电子补偿 

分 类 号：TM933[电气工程—电力电子与电力传动]