Effect and Analysis of Leakage Current on Error Characteristics of Current Transformer
Liu Gang1, Xiong Xiaofu1, Liao Ruijin1, Hao Jian1, Liu Kun2
1.State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044China 2.State Grid Sichuan Electric Power Corporation Metering Center Chengdu 610045China
Abstract：The error of current transformer in transmission system is tested at low voltage presently, and the inconsistence between testing condition and operational condition may result that tested data cannot reflect the error characteristic of current transformer precisely, which will lead to seriously wrong electric energy metering and even misjudgment on the qualification of the metering characteristics of current transformer. In this paper, effect of leakage current on error of current transformer was analyzed by means of theory, simulation and experiments. Testing results show that leakage current makes the value of the error smaller, and the effect becomes more significant with smaller current. In addition, the effect of leakage current on the error of current transformer can be neglected once current increases to a certain value. It is suggested that the error of current transformer should be tested at operational high voltage directly.
刘刚, 熊小伏, 廖瑞金, 郝建, 刘鹍. 泄漏电流对电流互感器误差特性的影响及分析[J]. 电工技术学报, 2018, 33(3): 697-704.
Liu Gang, Xiong Xiaofu, Liao Ruijin, Hao Jian, Liu Kun. Effect and Analysis of Leakage Current on Error Characteristics of Current Transformer. Transactions of China Electrotechnical Society, 2018, 33(3): 697-704.
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2018, Vol. 33 
