Journal ArticleDOI
The Effects of Geomagnetic Storms on Electrical Power Systems
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TLDR
In this paper, the authors summarized the significant problem areas of system disturbances and equipment effects due to geomagnetic storms, including increased VAR requirements and shifts in VAR flow, systemvoltage fluctuations, generation of harmonics, protective relayiing misoperations, and possible localized internal heating in transformers.Abstract:
Geomagnetic field fluctuations produce spurious, quasi-dc currents in power systems. The currents enter through system grounding points, and are of sufficient magnitude to cause half-cycle saturation in power transformers. These currents have been recorded and are summarized, and recommendations made in the significant problem areas of system disturbances and equipment effects due to geomagnetic storms. The major problem areas include increased VAR requirements and shifts in VAR flow, system-voltage fluctuations, generation of harmonics, protective relayiing misoperations, and possible localized internal heating in transformers. Recommendations relating to these effects have Pot been published previously.read more
Citations
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Journal ArticleDOI
The effects of geomagnetic disturbances on electrical systems at the earth's surface
TL;DR: In this article, the authors attempted to catalogue all the published reports of geomagnetic effects on electrical systems and show their occurrence in the context of the solar cycle and geOMagnetic activity variations for the years 1844 to 1996.
The Effects of Geomagnetic Disturbances on Electrical Systems at the Earth's Surface - An Update
TL;DR: In this article, the authors attempted to catalogue all the published reports of geomagnetic effects on electrical systems and show their occurrence in the context of the solar cycle and geOMagnetic activity variations for the years 1844 to 1996.
Journal ArticleDOI
Characteristics of transformer exciting-current during geomagnetic disturbances
R.A. Walling,A.N. Khan +1 more
TL;DR: In this article, an efficient method allowing the transformer flux offset and exciting current waveform to be determined for combined AC and geomagnetically induced current (GIC) excitation, without lengthy time-domain simulations, is described.
Journal ArticleDOI
Geomagnetically induced currents in the Finnish high-voltage power system
A. Viljanen,Risto Pirjola +1 more
TL;DR: In this article, the authors consider geomagnetic induced currents (GICs) in power systems from the viewpoint of a geophysicist and present several examples of theoretically computed GICs using different geophysical models.
Journal ArticleDOI
Classification and trend analysis of threats origins to the security of power systems
TL;DR: A framework to classify threats to power system secure operation is presented and a quantitative trend analysis of more than a hundred representative historic blackouts is performed to figure out the principal threats and the changing trend of threats over time.
References
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Journal ArticleDOI
Solar-Induced-Currents in Power Systems: Cause and Effects
TL;DR: In this paper, the effects of geomagnetic storms on electric power systems were investigated, and the important problem of internal localized heating in power transformers due to solar-induced currents was discussed.
Journal ArticleDOI
Power System Disturbances During A K-8 Geomagnetic Storm: August 4, 1972
V. D. Albertson,John M. Thorson +1 more
TL;DR: A moderately severe geomagnetic storm occurred on August 4, 1972, and the effects of that storm on electric power systems in the continental United States and parts of Canada are documented as discussed by the authors.
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