Title:	Protection of power transformers against the effect of magnetic storms
Authors:	Mayer, Daniel
Citation:	MAYER, D. Protection of power transformers against the effect of magnetic storms. Journal of ELECTRICAL ENGINEERING, 2021, roč. 72, č. 4, s. 249-255. ISSN: 1335-3632
Issue Date:	2021
Publisher:	De Gruyter Poland
Document type:	článek article
URI:	http://hdl.handle.net/11025/45631
ISSN:	1335-3632
Keywords in different language:	geomagnetic field;coronal mass ejection;geomagnetically induced currents;magnetic semi-saturation;frequency filter
Abstract in different language:	In the operation of large-scale power systems for the long-distance transmission of large amounts of electricity, a number of cases have been reported in which anomalies in the Earth’s magnetosphere, referred to as geomagnetic storms, have caused a severe system collapse. Changes in the geomagnetic field cause a semi-saturating phenomenon, in which the high-voltage lines and especially the high-voltage windings of the power transformers of the system are overloaded with current and subsequently also thermally. The present article briefly explains the physical nature of magnetic storms and then describes a new device that either eliminates the possibility of a step-down power transformer accident or significantly reduces its effects on the system. The essence of this device are frequency filters, which are connected in parallel to the high-voltage windings of power transformers. At the beginning of a geomagnetic storm, the frequency filter is automatically connected to the system and is automatically disconnected when it subsides. The operation of frequency filters does not require human intervention, acquisition and operating costs are low and their integration into existing power systems is easy.
Rights:	© Creative Commons Attribution-NonCommercial-NoDerivs License
Appears in Collections:	Články / Articles (KEP) OBD

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