Geomagnetically induced currents in Norway: the northernmost high-voltage power grid in the world

We have derived comprehensive statistics of geomagnetic activity for assessing the occurrence of geomagnetically induced currents (GIC) in the Norwegian high-voltage power grid. The statistical study is based on geomagnetic recordings in 1994–2011 from which the geoelectric field can be modelled and...

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Bibliographic Details
Published in:Journal of space weather and space climate 2014, Vol.4, p.A10
Main Authors: Myllys, Minna, Viljanen, Ari, Rui, Øyvind August, Ohnstad, Trond Magne
Format: Article
Language:English
Subjects:
Electric currents
Electric fields
Electric potential
Electricity distribution
Extrapolation
Extreme weather
Geoelectric fields
Geoelectricity
Geomagnetic activity
Geomagnetic storms
Geomagnetically Induced Currents (GIC)
Geomagnetism
Grounds
Magnetic fields
Magnetic storms
Mathematical models
Recording
Statistics
Storms
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Summary:We have derived comprehensive statistics of geomagnetic activity for assessing the occurrence of geomagnetically induced currents (GIC) in the Norwegian high-voltage power grid. The statistical study is based on geomagnetic recordings in 1994–2011 from which the geoelectric field can be modelled and applied to a DC description of the power grid to estimate GIC. The largest GIC up to a few 100 A in the Norwegian grid occur most likely in its southern parts. This follows primarily from the structure of the grid favouring large GIC in the south. The magnetic field has its most rapid variations on the average in the north, but during extreme geomagnetic storms they reach comparable values in the south too. The ground conductivity has also smaller values in the south, which further increases the electric field there. Additionally to results in 1994–2011, we performed a preliminary estimation of a once per 100 year event for geoelectric field by extrapolating the statistics. We found that the largest geoelectric field value would be twice the maximum in 1994–2011. Such value was actually reached on 13–14 July 1982.
ISSN:2115-7251
2115-7251
DOI:10.1051/swsc/2014007