Assessing the hazard from geomagnetically induced currents to the entire high-voltage power network in Spain

Earth, Planets and Space

Table 2 Comparison of the total GICs flowing in the ground grid of each substation

Name	GIC for northward E field (A)	GIC for eastward E field (A)	GIC for northward E field, HV only (A)	GIC for eastward E field, HV only (A)	GIC for northward E field (% diff.)	GIC for eastward E field (% diff.)
Sub 3	139.85	−109.49	131.33	−185.03	6.1	69.0
Sub 4	19.98	−124.58	29.66	−139.94	48.4	12.3
Sub 5	−279.08	−65.46	−172.81	−126.07	38.1	92.6
Sub 6	−57.29	354.52	−49.92	319.51	12.9	9.9
Sub 7	0.00	0.00	0.00	0.00	0.0	0.0
Sub 8	60.90	134.30	61.74	131.53	1.4	2.1

The table shows the comparison of the total GICs flowing in the ground grid of each substation for the benchmark test case (Table VII of Horton et al. 2012) when a northward or eastward uniform electric field of 1 V/km was present (first two columns after the column of names), and the GICs obtained using only the high-voltage circuit. The percent differences (% diff.) data are also shown. HV stands for high voltage.