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Inductive current transformer accuracy of transformation for the PQ measurements

机译：电感式电流互感器的PQ测量转换精度

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摘要

Inductive current transformer made of magnetic cores with high permeability are used for accurate wideband transformation of distorted current required by the power quality (PQ) measurements. However, such solutions are often characterized by not acceptable additional secondary current distortion in condition of variation of primary current rms value. The problem presented in this paper concerns determination and analysis of mutually exclusive magnetic requirements on inductive current transformer accuracy for transformation of current in both mentioned conditions. To show relevant considerations and support drawn conclusions about source of deterioration of inductive current transformers accuracy of transformation simple and effective procedure for designing inductive current transformer is discussed. The usage of the composited axially magnetic core from the magnetic cores made of permalloy and transformer steel ensured acceptable composite error for transformation of a given harmonic of distorted current and high accuracy in condition of variation of primary current rms value. Obtained resultant magnetization curve, regardless the rms value of primary current and its distortion level, provides proper magnetic permeability to prevent decrease of transformation accuracy for distorted current. The novelty of the paper concerns presentation of designing process and requirement that ensure such operation of inductive current transformer not obtainable without usage of the composited axially magnetic core. (C) 2017 Elsevier B.V. All rights reserved.
机译：由具有高导磁率的磁芯制成的电感式电流互感器用于对电能质量（PQ）测量所需的失真电流进行精确的宽带转换。但是，这样的解决方案通常以初级电流有效值变化的情况下不可接受的附加次级电流失真为特征。本文提出的问题涉及确定和分析互感性对电感电流互感器精度的要求，以在上述两种情况下进行电流转换。为了展示相关的考虑因素并支持得出有关电感电流互感器劣化源的结论，讨论了设计电感电流互感器简单有效的过程。由坡莫合金和变压器钢制成的磁芯使用轴向复合磁芯可确保在给定的畸变电流谐波转化时可接受的复合误差，并且在一次电流有效值变化的情况下具有很高的精度。无论初级电流的均方根值及其畸变程度如何，获得的合成磁化曲线都可提供适当的导磁率，以防止因畸变电流而导致的转换精度下降。本文的新颖性涉及设计过程和要求的介绍，以确保不使用复合轴向磁芯就无法获得感应电流互感器的这种操作。 （C）2017 Elsevier B.V.保留所有权利。

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