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Dennis Albert  Investigation of Low Frequency Currents in the Electrical Power Transmission Grid and their Effects on Power Transformers
Low frequency currents (0-1 Hz) (LFC) in the transmission network can have a negative influence on its stability. The currents are caused by geomagnetic influences (increased solar activity, Geomagnetically induced currents, GIC) or other electrical systems, such as direct current powered transportation systems.  A main problem caused by the superimposed quasi direct current is the associated saturation of transformers. This increases the reactive power consumption and also the power loss in the transformer.
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