Title:	Direct currents in power transformers
Authors:	Štork, Milan Mayer, Daniel
Citation:	ŠTORK, M., MAYER, D. Direct currents in power transformers. Journal of Electrical Engineering = Elektrotechnický časopis, 2019, roč. 70, č. 1, s. 69-73. ISSN 1335-3632.
Issue Date:	2019
Publisher:	De Gruyter
Document type:	článek article
URI:	2-s2.0-85062832281 http://hdl.handle.net/11025/33950
ISSN:	1335-3632
Keywords in different language:	geomagnetic field;coronal mass ejection;geomagnetically induced current;non-linear transformer;magnetic semi-saturation
Abstract in different language:	The article is devoted to the physical nature of geomagnetism, magnetic storms and methods of predicting their origin and deals with geomagnetic induced currents called GIC (Geomagnetically Induced Currents) and their effect on power transformers. A simplified, single-phase transmission system is described mathematically and its analysis was performed. Also the phenomenon of periodic semi-saturation of the magnetic circuit of the transformers resulting in current overload of the transformer windings, which can lead to thermal damage of the windings is explained. In addition, there is a significant deformation of the currents in the electrical system. The numerical solution of the system was verified by measurement on an electrical model.
Rights:	Plný text je přístupný v rámci univerzity přihlášeným uživatelům. © De Gruyter
Appears in Collections:	Články / Articles (KTE) Články / Articles (KAE) Články / Articles (RICE) OBD

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