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

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