English
 
Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
Add to Basket
  Local TagsRelease HistoryDetailsSummary

Released
Conference Paper

Extreme value analysis to assess the risk from Geomagnetically Induced Currents to individual transformers of the Spanish power grid

Authors

Marsal,  Santiago
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Curto,  Juan José
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Torta,  Joan Miquel
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Piña-Varas,  Maria Perla
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ledo,  Juan José
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Canillas-Pérez,  Victoria
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Martí,  Anna
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Marcuello,  Alejandro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

External Ressource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in GFZpublic
Supplementary Material (public)
There is no public supplementary material available
Citation

Marsal, S., Curto, J. J., Torta, J. M., Piña-Varas, M. P., Ledo, J. J., Canillas-Pérez, V., Martí, A., Marcuello, A. (2023): Extreme value analysis to assess the risk from Geomagnetically Induced Currents to individual transformers of the Spanish power grid, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1568


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018038
Abstract
Geomagnetically induced currents (GIC), ultimately due to disturbed conditions in the Earth’s space environment caused by Space Weather, affect power transmission grid transformers differently depending on latitude, ground conductivity, transformer type and grid topology. We evaluate the risk from GIC threat to transformers as a product of hazard and vulnerability. Hazard evaluates the probability of occurrence of geoelectric fields, which in turn depends on the primary currents flowing above the site in question, as well as on the local subsurface conductivity. On the other hand, the vulnerability of transformers depends on their winding resistances and on the network topology, which will favor GIC flow for certain orientations of the regional geoelectric field. Given that the period of available data is finite, and that it is precisely the large GICs that cause the most damage, an adequate risk assessment requires extreme value analysis techniques to obtain a continuous and reliable probability function for extreme GIC events. The method is exemplified with the case of one of the most vulnerable transformers of the Spanish power grid using magnetic observatory records of the period 2000 – 2021 and a ground conductivity model for the Iberian Peninsula.