Abstract
Geomagnetically induced currents (GIC) are a ground end manifestation of space weather processes. During the large geomagnetic storms the GIC end up flowing between the ground points of the power transformers and the electric power transmission lines connecting the transformers. In the high latitude regions damages to the power transformers are reported where the range of the storm time geomagnetic variations is very large and hence the large GIC compared to the range of variations observed at low latitudes. However GIC damages to the power transformers are a complex process it needs careful evalution even at the low latitude regions in Brazil. We report here a first such study conducted under a cooperative project between FURNAS and INPE.
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