The Effect of the Load Power Factor of the Inductive CT’s Secondary Winding on Its Distorted Current’s Harmonics Transformation Accuracy

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 17, 1-11

Abstract: In this paper, we present an investigation into the influence of the load power factor of secondary winding on the metrological performance of inductive CTs with frequencies from 50 Hz to 5 kHz of the harmonic of a transformed distorted current. The results clearly indicated that the inductive load caused a deterioration in the transformation accuracy of the inductive CT. To ensure the most advantageous conditions of their operation, a resistive load should be used. The inductive CTs for the frequencies of the transformed harmonic of a distorted primary current from 50 Hz to 5 kHz may ensure the accuracy class designated for the transformation of the sinusoidal current of a frequency of 50 Hz with the same limiting values of errors. Moreover, an analysis of the generated low-order harmonics by a 300 A/5 A CT determined for the power factor of 0.8 inductive and 1.0 of the secondary winding was investigated. These results for the transformed distorted currents of 3rd, 5th and 7th higher harmonics were evaluated for a rated load and 25% of this value.

Keywords: current transformer; accuracy; distorted current; higher harmonics; current error; power factor; instrument transformer; phase displacement; load (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 (3)

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