Frequency analysis of DC tolerant current transformers

2013 Joint IMEKO (International Measurement Confederation) TC1-TC7-TC13 Symposium: Measurement Across Physical and Behavioural Sciences

Mlejnek, P.^1 ; Kaspar, P.^2

Czech Technical University in Prague, University Centre for Energy Efficient Buildings, Nam. Sitna 3105, 272 01 Kladno, Czech Republic^1

Czech Technical University in Prague, Faculty of Electrical Engineering, Technicka 2, 166 27 Prague 6, Czech Republic^2

关键词: Frequency Analysis;    Frequency ranges;    Harmonics component;    International standards;    Non-sinusoidal voltage;    Power distribution network;    Quality of electric energies;    Wide frequency range;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/459/1/012053/pdf
DOI  :  10.1088/1742-6596/459/1/012053

来源: IOP

【 摘 要 】

This article deals with wide frequency range behaviour of DC tolerant current transformers that are usually used in modern static energy meters. In this application current transformers must comply with European and International Standards in their accuracy and DC tolerance. Therefore, the linear DC tolerant current transformers and double core current transformers are used in this field. More details about the problems of these particular types of transformers can be found in our previous works. Although these transformers are designed mainly for power distribution network frequency (50/60 Hz), it can be interesting to understand their behaviour in wider frequency range. Based on this knowledge the new generations of energy meters with measuring quality of electric energy will be produced. This solution brings better measurement of consumption of nonlinear loads or measurement of non-sinusoidal voltage and current sources such as solar cells or fuel cells. The determination of actual power consumption in such energy meters is done using particular harmonics component of current and voltage. We measured the phase and ratio errors that are the most important parameters of current transformers, to characterize several samples of current transformers of both types.