A high accuracy on-line calibration system for current transformers based on improved digital integrator

被引：0
|
作者：
Li Z. [1 ]
Yan S. [1 ]
Hu W. [1 ]
Li Y. [1 ]
Li Z. [1 ]
机构：
[1] Hubei Key Laboratory of Cascaded Hydropower Stations Operation & Control, Three Gorges University, Yichang, 443002, Hubei Province
来源：
Dianwang Jishu/Power System Technology | 2016年 / 40卷 / 03期
关键词：
Clamp-shape Rogowski coil; Current transformer; Digital integrator; On-line calibration; Without power outage;
D O I：
10.13335/j.1000-3673.pst.2016.03.046
中图分类号：
学科分类号：
摘要：
To solve the problems of traditional calibration methods, this paper proposes a high accuracy on-line calibration method for current transformers. By using a clamp-shape Rogowski coil as the standard current transformer, the power of the line needn't to be interrupted when calibration, and the volume and weight of standard transformer are reduced greatly. The output signal of the clamp-shape Rogowski coil needs to be integrated, and to overcome the problems of analog integrators, which have temperature drift and zero drift, a high accuracy digital integrator is proposed, and the accuracy and stability of the signal processing circuit can be improved. Test results indicate that the accuracy of the whole calibration system can reach up to 0.05 accuracy class. The on-line calibration system can calibrate the traditional and electronic current transformers when the line is energized, which avoiding the power-off loss. © 2016, Power System Technology Press. All right reserved.
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页码：978 / 982
页数：4
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