Which risk increases in electrical power distribution systems during geomagnetic disturbances (GMD)?

💡 Explanation

During GMD, geomagnetically induced currents (GICs), which are DC or very low frequency, flow through power grids and cause transformer saturation because the magnetic core is driven into a nonlinear region. Therefore, transformer saturation results, rather than overheating, breakdown, or malfunction which require different electrical mechanisms.

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