Abstract

A method for estimating the limits of errors of electromagnetic current transformers is proposed. In contrast to the standard technique, the proposed method considers not only the basic factors, but also additional ones, that affect the results of measurements. The additional influencing factors are the residual magnetization of the core and the nonsinusoidality of the current under measurement. The method was developed and explored based on a known nonlinear mathematical model of the current transformer. By the example of the standard TOL-10 current transformer, it is shown how the limits of errors of the current transformers can be determined for the operating conditions. Based on the estimation of the error limits, an accuracy class can be accurately attributed to the newly manufactured transformers and the conformity of the limits of errors of the current transformers in service to their class of accuracy can be verified. The method also allows increasing the reliability and accuracy of the measured results and the efficiency of the current transformers without making any design alterations.

中文翻译：

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电磁电流互感器误差极限的估算方法

摘要

提出了一种估计电磁电流互感器误差极限的方法。与标准技术相反，该方法不仅考虑了影响测量结果的基本因素，而且还考虑了其​​他因素。其他影响因素是铁心的剩余磁化强度和被测电流的非正弦度。该方法是根据已知的电流互感器非线性数学模型开发和探索的。以标准TOL-10电流互感器为例，它显示了如何针对运行条件确定电流互感器的误差极限。根据错误限制的估算，可以将精度等级准确地归因于新制造的变压器，并且可以检验使用中的电流互感器的误差极限是否符合其精度等级。该方法还允许在不进行任何设计更改的情况下提高测量结果的可靠性和准确性以及电流互感器的效率。