title: DC-Compensated Current Transformer.
abstract: 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 error to 0.15%. This concept can be used not only for high-end CTs with a nanocrystalline core, but it also works for low-cost CTs with FeSi cores. The method described here allows simultaneous measurements of the DC current component.
authors.affiliation: Faculty of Electrical Engineering, Czech Technical University, Technicka 2, 166 27 Praha 6, Czech Republic. ripka@fel.cvut.cz.
authors.forename: Pavel
authors.initials: P
authors.lastname: Ripka
authors.affiliation: Faculty of Electrical Engineering, Czech Technical University, Technicka 2, 166 27 Praha 6, Czech Republic. draxler@fel.cvut.cz.
authors.forename: Karel
authors.initials: K
authors.lastname: Draxler
authors.affiliation: Czech Metrology Institute, V Botanice 4, 150 72 Praha 5, Czech Republic. rstyblikova@cmi.cz.
authors.forename: Renata
authors.initials: R
authors.lastname: Styblíková
keywords: DC tolerance; current sensor; current transformer