Understanding the Frequency Characteristics of Current Error and Phase Displacement of the Corrected Inductive Current Transformer

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

Energies, 2022, vol. 15, issue 15, 1-16

Abstract: The paper presents investigations and analysis of the parameters of the magnetic part of the equivalent circuit of the inductive CT in the frequencies range from 50 Hz to 5 kHz. Therefore, a measuring circuit used to determine the values of the transverse branch elements was developed. The research performed helps to understand the obtained values of the frequency characteristics of the current error and phase displacement of the corrected inductive current transformer. Moreover, the vectorial diagrams for the 1st, 20th and 100th harmonics are provided with consideration of the influence of the applied turns number correction of the secondary winding. The obtained results show that the increase in the frequency of transformed higher harmonics may cause a decrease in the values of the current error and phase displacement for the non-corrected inductive current transformer. However, if the number of turns of the secondary winding is corrected, the behavior is reversed, where the values of the current error are higher with increased frequency. In the paper, the influence of the self-generation phenomenon of the low-order harmonics is also considered.

Keywords: current transformer; accuracy; higher harmonics; distorted current; turns ratio correction; current error; phase displacement (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 (6)

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