About: AC/DC Current Transformer with Single Winding

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	DC currents in power grids are created by induction from geomagnetic variations and newly also by transformerless power inverters installed in solar power stations. These currents may cause serious errors of current transformers (CTs) measuring the consumed energy, but also cause overload of distribution transformers which may result in blackout. Installing DC current sensors into the grid would be very expensive. We have shown that the existing CTs in the grid can be used in the fluxgate mode to simultaneously measure DC current. Utilizing this mode, the CT AC error is inevitably increased. We analyze the sources of these errors and show techniques to reduce them. The experiments were made on the off-the-shelf 500 A/5A CT. We show that the uncompensated 5A DC current without compensation increases its AC amplitude error from 0.1% to 1%. We also found that the dominant additional error was caused by the increased burden. With the optimized design of the excitation circuit it is possible to sense a DC current component with 10% accuracy and reduce the additional AC error from previously reported 1.5% to 0.1% when the DC current component is compensated. This technique can be widely used to improve the AC accuracy of the existing CTs. DC currents in power grids are created by induction from geomagnetic variations and newly also by transformerless power inverters installed in solar power stations. These currents may cause serious errors of current transformers (CTs) measuring the consumed energy, but also cause overload of distribution transformers which may result in blackout. Installing DC current sensors into the grid would be very expensive. We have shown that the existing CTs in the grid can be used in the fluxgate mode to simultaneously measure DC current. Utilizing this mode, the CT AC error is inevitably increased. We analyze the sources of these errors and show techniques to reduce them. The experiments were made on the off-the-shelf 500 A/5A CT. We show that the uncompensated 5A DC current without compensation increases its AC amplitude error from 0.1% to 1%. We also found that the dominant additional error was caused by the increased burden. With the optimized design of the excitation circuit it is possible to sense a DC current component with 10% accuracy and reduce the additional AC error from previously reported 1.5% to 0.1% when the DC current component is compensated. This technique can be widely used to improve the AC accuracy of the existing CTs. (en)
Title	AC/DC Current Transformer with Single Winding AC/DC Current Transformer with Single Winding (en)
skos:prefLabel	AC/DC Current Transformer with Single Winding AC/DC Current Transformer with Single Winding (en)
skos:notation	RIV/68407700:21230/13:00207125!RIV14-MSM-21230___
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GAP102/12/2177)
http://linked.open...vai/riv/dodaniDat	2014
http://linked.open...aciTvurceVysledku	Draxler, Karel Ripka, Pavel
http://linked.open.../riv/druhVysledku	O - Ostatní výsledky nezařaditelné do žádného z výše uvedených druhů výsledku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	České vysoké učení technické v Praze / Fakulta elektrotechnická
http://linked.open...dnocenehoVysledku	59327
http://linked.open...ai/riv/idVysledku	RIV/68407700:21230/13:00207125
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	current transformer; single winding (en)
http://linked.open.../riv/klicoveSlovo	single winding current transformer
http://linked.open...ontrolniKodProRIV	[D92814D9FF20]
http://linked.open...in/vavai/riv/obor	JA
http://linked.open...ichTvurcuVysledku	2 (xsd:int)
http://linked.open...cetTvurcuVysledku	3 (xsd:int)
http://linked.open...vavai/riv/projekt	Nanostructured soft magnetic materials for sensors
http://linked.open...UplatneniVysledku	2013
http://linked.open...iv/tvurceVysledku	Draxler, Karel Ripka, Pavel Styblíková, R.
http://localhost/t...ganizacniJednotka	21230

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