Ms. Xuan Zhu Profile

Xuan Zhu

at Harbin Univ. of Science and Technology

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Proceedings Article | 14 August 2019 Paper

Research on nonlinear correction system of current transformer

Jie Liu, Jie Pei, Xuan Zhu

Proceedings Volume 11179, 1117946 (2019) https://doi.org/10.1117/12.2540066

KEYWORDS: Transformers, Magnetism, Distortion, Resistance, Electromagnetism, Complex systems, Telecommunications, Error analysis, Field programmable gate arrays, Nonlinear optics

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A new nonlinear correction method of current transformer is proposed for the second current signals distortion which caused by the iron core saturation of current transformer (CT). In this method, the saturation interval is determined by the sudden change characteristic of the secondary current saturation waveform, the secondary current value of the saturation transition interval is estimated by the least squares method, and the relationship between the hysteresis current, the secondary current and the magnetic flux under the saturation of the current transformer is used to establish the positive definite linear system of the magnetic flux estimation, the secondary current value after compensation can be obtained by inverse transformation. This paper analyzes the new method of current transformer nonlinear compensation theoretically and experimentally, the experimental results verified the effectiveness of this method, the method can improve the measurement accuracy of the current transformer from the original degree 0.5 to degree 0.1.

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