Demagnetization of instrument transformers before calibration

Autor: Karel Draxler, Renata Styblikova

Publikováno v: Journal of Electrical Engineering. 69:426-430

This paper describes the influence of magnetization of an instrument current transformer (ICT) core on ICT errors, and presents a procedure for demagnetizing an ICT. The dependence of ICT errors on the magnetization of the ICT core for different magn

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::faedfd2b48fc45b8252e3b95aa379ff0
https://doi.org/10.2478/jee-2018-0066

DC-Compensated Current Transformer

Autor: Pavel Ripka, Karel Draxler, Renata Styblíková

Publikováno v: Sensors, Vol 16, Iss 1, p 114 (2016)

Instrument current transformers (CTs) measure AC currents. The DC component in the measured current can saturate the transformer and cause gross error. We use fluxgate detection and digital feedback compensation of the DC flux to suppress the overall

Externí odkaz: https://doaj.org/article/c1995a11979e4e3fac7a1a9f3ee5ada9

Calibration of Burdens for Instrument Transformers

Autor: Renata Styblikova, Karel Draxler, Jan Hlavacek, Michal Ulvr

Publikováno v: I2MTC

The first part of this paper deals with the influence of burden accuracy on the errors of current and voltage instrument transformers. The requirement stated in the prepared standard, corresponding to a tolerance of burden value B ± 3 % and power fa

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8871784098d9903f6d05aee87fb8f184
https://doi.org/10.1109/i2mtc43012.2020.9128565

A Fluxgate Current Sensor With an Amphitheater Busbar

Autor: Karel Draxler, Pavel Ripka, Vaclav Grim, Michal Pribil, Vojtech Petrucha

Publikováno v: IEEE Transactions on Magnetics. 52:1-4

Large dc and ac electric currents are often measured by open-loop sensors without a magnetic yoke. A widely used configuration uses a differential magnetic sensor inserted into a hole in a flat busbar. The use of a differential sensor offers the adva

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::24b3fd85cee1f39ef9ac9ebc639922fa
https://doi.org/10.1109/tmag.2016.2540523

Results of an International Comparison of Instrument Current Transformers up to 10 kA at 50 Hz Frequency

Autor: R. Martin, Gabriella Crotti, T. Cincar-Vujovic, R. Kampfer, Enrico Mohns, C. Mester, I. Blanc, A.J. Wheaton, Jan Hlavacek, M. Schnaitt, M. Hammarquist, Emil Dimitrov, H.E. van den Brom, W. Waldmann, Jari Hällström, Renata Styblikova, Karel Draxler, Gert Rietveld, H. Cayci, Fernando Garnacho, A. Bergman, B. Paczek, E-P. Suomalainen, G. Sadkowski

Publikováno v: Draxler, K, Styblíková, R, Hlavacek, J, Rietveld, G, van den Brom, H E, Schnaitt, M, Waldmann, W, Dimitrov, E, Cincar-Vujovic, T, Paczek, B, Sadkowski, G, Crotti, G, Martin, R, Garnacho, F, Blanc, I, Kämpfer, R, Mester, C, Wheaton, A, Mohns, E, Bergman, A, Hammarquist, M, Çayci, H, Hällström, J & Suomalainen, E-P 2018, Results of an International Comparison of Instrument Current Transformers up to 10 kA at 50 Hz Frequency . in CPEM 2018-Conference on Precision Electromagnetic Measurements . IEEE Institute of Electrical and Electronic Engineers, Conference on Precision Electromagnetic Measurements, CPEM 2018, Paris, France, 8/07/18 . https://doi.org/10.1109/CPEM.2018.8500821

Traceability of the current ratio is crucial for the measurement of electrical energy in revenue metering. A comparison of the AC current ratio was therefore performed within EURAMET in the time period 2012 - 2016, using a precision CT as the traveli

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5dc64695d4a01930d35857de3a9f2bff
https://doi.org/10.1109/CPEM.2018.8500821