Evaluation of the Current Shunt Influence on the Determined Wideband Accuracy of Inductive Current Transformers

Michal Kaczmarek (), Piotr Kaczmarek and Ernest Stano
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Michal Kaczmarek: Institute of Mechatronics and Information Systems, Lodz University of Technology, 90-537 Lodz, Poland
Piotr Kaczmarek: Institute of Mechatronics and Information Systems, Lodz University of Technology, 90-537 Lodz, Poland
Ernest Stano: Institute of Mechatronics and Information Systems, Lodz University of Technology, 90-537 Lodz, Poland

Energies, 2022, vol. 15, issue 18, 1-12

Abstract: This manuscript presents performed laboratory studies and the analysis of the impact of current shunt values used in the differential connection on the wideband metrological performance of inductive current transformers. Moreover, a comparison of the accuracy of wideband and 50 Hz-type inductive current transformers in the specified frequency range from 50 Hz to 5 kHz is presented. The main factor which may influence the wideband accuracy of inductive current transformers is the phenomenon of self-generation. This causes rapid changes in the accuracy, and simultaneously causes the most positive and the most negative values of current error and phase displacement. To evaluate the metrological performance in the differential measurement setup for higher harmonics of the distorted current, a digital acquisition board was used. Obtained results show that if proper values of current shunt resistance are chosen, such devices may be used to evaluate the wideband accuracy of inductive current transformers. The results indicate that the typical units designed for the transformation of sinusoidal current with a frequency of 50 Hz can achieve a comparable metrological performance to that of the wideband inductive current transformer.

Keywords: distorted current; current transformer; accuracy; higher harmonics; phase displacement; current error; differential circuit; wideband instrument transformer (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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