Wideband Self-Calibration Method of Inductive CTs and Verification of Determined Values of Current and Phase Errors at Harmonics for Transformation of Distorted Current

Sensors

Ernest Stano¹  Michal Kaczmarek¹ 

[1] Institute of Mechatronics and Information Systems, Lodz University of Technology, Stefanowskiego 18/22 St, 90-924 Lodz, Poland;

关键词: inductive current transformer;    current and phase errors;    harmonics;    distorted current;    power quality;    composite error;   

DOI  :  10.3390/s20082167

来源: DOAJ

【 摘 要 】

Self-calibration of a designed wideband inductive current transformer (CT) was carried out in the ampere-turns condition. This method does not require a reference transducer. The values of current and phase errors at the harmonics of frequencies from 100 Hz to 5 kHz were determined for the distorted primary current of the rated main frequency equal to 50 Hz. These results were verified based on the comparison of values measured between two CTs and calculated as the difference between values obtained from their calibration. Moreover, from vectorial diagrams drawn for transformation of the higher harmonics, the source of the change in the values of current and phase errors with frequency is explained. Furthermore, the method for calculation of the values of the corresponding harmonics of the current associated with the active power losses in the core and the magnetization current is presented.

【 授权许可】

Unknown