| 引用本文: | 刘刚,熊小伏,廖瑞金,郝建,刘鹍.基于不同检测方法的高压电流互感器误差比较与分析[J].电力自动化设备,2019,39(3): |
| LIU Gang,XIONG Xiaofu,LIAO Ruijin,HAO Jian,LIU Kun.Error comparison and analysis of high-voltage current transformer based on different testing methods[J].Electric Power Automation Equipment,2019,39(3): |
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| 摘要: |
| 目前对高压电流互感器的误差检测有多种方法，但缺乏对各检测方法所得误差结果差异性和准确性的比较分析。采用单相检测法检测电流互感器误差、考虑电压对电流互感器误差的影响计算电流误差的综合绝对值、额定电压下检测电流互感器误差3种检测方法分别对高压电流互感器的误差开展检测和比较分析，并对其差异原因进行了理论分析。结果表明，电压会使电流互感器的比差和角差向负方向偏移，当电流较小(特别是20%额定电流以下)时，电压对电流误差影响较大，随着电流增大，其影响逐渐减小直至可以忽略；低压下测得的电流互感器误差在电流较小时不够准确，电流误差的综合绝对值远大于在高压下直接测得的电流误差，对高压电流互感器的误差检测宜采用在额定电压状态下直接测量的方式。 |
| 关键词: 检测方法 电流互感器 误差分析 泄漏电流 电流误差的综合绝对值 |
| DOI：10.16081/j.issn.1006-6047.2019.03.016 |
| 分类号:TM452 |
| 基金项目: |
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| Error comparison and analysis of high-voltage current transformer based on different testing methods |
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LIU Gang1, XIONG Xiaofu1, LIAO Ruijin1, HAO Jian1, LIU Kun2
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1.State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China;2.State Grid Sichuan Electric Power Corporation Metering Center, Chengdu 610045, China
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| Abstract: |
| There are various methods to test the error of high-voltage current transformer, however, there is little analy-sis on the difference and accuracy among testing results of these methods. The error of high-voltage current transformer is tested and compared with single-phase testing, absolute value calculation of the current error considering the influence of voltage and current error testing under rated voltage. And the reason of their differences is analyzed. The results show that voltage has a negative influence on ratio error and phase displacement of current transformer, and its effect is mainly predominant at currents less than 20% of rated current. The larger the current is, the smaller the influence will be, and the influence decreases gradually until it can be neglected with the increase of current. The current errors tested at low voltage are inaccurate at low current, and the absolute value of the variations of current error is much larger than the results tested at high voltage, as a result, the current error of high-voltage current transformer should be tested directly at rated primary voltage. |
| Key words: testing method current transformer error analysis leakage current absolute value of the variations of current error |
