Michal Kaczmarek

TL;DR: Possible conditions are discussed that may cause decrease of transformation accuracy of the inductive current transformers for higher harmonics of distorted current in relation to sinusoidal current of their rated frequency.

TL;DR: The results of performed analyses shows that the values of current and phase errors of transformation of the low order higher harmonics by inductive CT depends significantly from the phase angle between transformedHigher harmonics of the distorted primary current and the self-generated higher harmonic of the secondary current.

TL;DR: In this article, the authors present results explaining the phenomena of the inductive current transformers (CTs) metrological properties deterioration for the transformation of the distorted currents in the CTs.

TL;DR: In this paper, it was found that higher harmonic from disturbance signal in the primary circuits of both voltage and current transformers causes increase of errors during the transfer of the signal basic harmonic (50 Hz) Furthermore, in the case of disturbance signals which frequencies are higher than 50 Hz the decrease in transfer ratio and increase of the higher harmonic phase displacement after transfer by the instrument transformer is noticeable.

TL;DR: In this paper, the concept is discussed for evaluation of accuracy of inductive current transformer (CT) for transformation of distorted current higher harmonics, and the results of FFT analysis of measured composite error are used to simultaneously evaluate tested CT maximum current error and phase displacement of transformation for each of the distorted current harmonic.