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Fig. 6.


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Histograms of the 30-min maximum of the GIC sum divided by the number of nodes in the Nordic high-voltage power grid for different ranges of |dH/dt|30 at UPS. Percentile bins are used in the horizontal axis. The range of GIC30 in amperes is also given in each panel. For example, the upper left plot shows the distribution when |dH/dt|30 varies between 0.10 and 0.38 nT/s which correspond to the percentile limits of 90% and 99%, respectively. Compare also to Figure 5.

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