电磁式电流互感器谐波特性  

Harmonic characteristics of electromagnetic current transformer

作　　者：李鹤 岳长喜 邵海明[2] 刘星余 白德进 LI He;YUE Chang-xi;SHAO Hai-ming;LIU Xing-yu;BAI De-jin(Metrology Institute,China Electric Power Research Institute Co.Ltd.,Wuhan 430074,China;Institute of Electromagnetic Metrology,National Institute of Metrology,Beijing 100029,China;School of Instrument Science and Optoelectronic Engineering,Beijing Information Science and Technology University,Beijing 100192,China)

机构地区：[1]中国电力科学研究院有限公司计量研究所,武汉430074 [2]中国计量科学研究院电磁计量科学研究所,北京100029 [3]北京信息科技大学仪器科学与光电工程学院,北京100192

出　　处：《沈阳工业大学学报》2020年第2期121-126,共6页Journal of Shenyang University of Technology

基　　金：国家重点研发计划项目(2016YFF0102400);国家电网公司总部科技项目(JL71-15-023).

摘　　要：针对目前利用电磁式电流互感器测量谐波电流特性的研究较少,可能会对电网谐波电流治理、电能计量产生不利影响的现状,利用T型等效电路推导了CT用于测量交流电流的理论误差,并采用两种试验方法实测了交流电流及谐波电流误差.分析了CT误差与频率的关系及基波电流与谐波电流对彼此误差的影响.结果表明,20%以下的谐波含量对基波误差影响较小;采用低值阻性负载,普通CT变换各次谐波电流的准确度优于1%.Focused on the current situation that fewer researches on harmonic current characteristics measured with an electromagnetic current transformer( CT) have been proposed,which may have harmful influence on the harmonic current surveillance in power grids and electric energy metering,the theoretical error of CT for alternating current( AC) measurement was deduced using T-type equivalent circuit. In addition,the errors of AC current and harmonic current were measured with two experimental methods. The relationship between CT error and frequency was analyzed,and the influence of fundamental and harmonic current on each other’s error was discussed. The results show that the harmonic content lower than 20% has less influence on the fundamental error,and the transformation accuracy of harmonic current of different orders using a common CT with low value resistive load is better than 1%.

关 键 词：电流互感器 电流比例 谐波电流 宽频误差 校准 测量 等安匝 低值阻性负载 

分 类 号：TM45[电气工程—电器]