Operation of the Electronic Current Transformer for Transformation of Distorted Current Higher Harmonics

Energies

Artur Szczęsny¹  Ernest Stano²  Michal Kaczmarek² 

[1] Institute of Electrical Engineering Systems, Lodz University of Technology, 90-537 Lodz, Poland;Institute of Mechatronics and Information Systems, Lodz University of Technology, 90-537 Lodz, Poland;

关键词: current transducer;    electronic current transformer;    higher harmonics;    distorted current;    Hall effect;   

DOI  :  10.3390/en15124368

来源: DOAJ

【 摘 要 】

This paper evaluates an electronic current transformer’s wideband accuracy in the transformation of distorted current harmonics. The tests were performed in the range of frequencies from 50 Hz to 5 kHz. The utmost importance was dedicated to the transformation of the low-order higher harmonics. The novelty of this paper involves the analysis of the self-generation of the third and fifth higher harmonics caused by the nonlinearity of magnetic core magnetization characteristics. Therefore, what is considered new in this investigation is that this phenomenon has a significant influence on values of current errors and phase displacements despite the presence of the operational amplifiers and the Hall sensors in the output circuits. Another important factor to consider is the influence of the RMS value of the primary current and output load of the ECT on wideband accuracy. To show the backgrounds of the performed laboratory studies, we also discuss the operation principles of the ECTs with closed and open feedback loops. The accuracy of the tested ECT deteriorated—as with the inductive CT—by the self-generation phenomenon. This resulted in rapid changes in the values of current errors and phase displacements determined for the low-order higher harmonics.

【 授权许可】

Unknown