## 3 Electrode Station Configuration
### General Remarks
axis), the corresponding actual required length is 87.5 m (from the superposition model results in Table 5), while the available length is only 50 m.
* The developed absolute potentials and the corresponding values of the electrode station resistance, with respect to remote earth, are considerably worse (20.51 kV, 17.57 \(\Omega\)) compared to the first (17.30 kV and 14.82 \(\Omega\), according to Table 15 in [2]) and second configurations (18.40 kV and 15.76 \(\Omega\), according to Table 1), slightly worse compared to the fifth (20.35 kV and 17.43 \(\Omega\) according to Table 4), and slightly better compared to the third (21.48 kV and 18.40 \(\Omega\) according to Table 2) and the fourth configurations (21.58 kV and 18.49 \(\Omega\) according to Table 3). * In field behaviour results, there is a similarity in the case of single-frame non-operation, between the 1 st and 6 th, the 2 nd and 5 th, as well as between the 3 rd and 4 th, through an appropriate mirroring consideration. However, when determining the absolute potentials, there is a slight difference since the integration is always conducted on the Ox semi-axis. Figure 26: (**a**) Electric field strength, (**b**) area of electric field strength; blue denotes values lower and yellow denotes values higher than the limit of 1.25 V/m, with linear current sources, regarding an electrode station with the 6 th configuration, in the area of Korakia (\(\rho_{S}\) = \(\infty\), without dam, \(\rho_{w}\) = 0.25 \(\Omega\)-m, \(\ell_{p}\) = 0.50 m, \(d_{fp}\) = 11.00 m, \(s_{c}\) = 10.00 m, \(L\) = 2.13 m, \(\theta_{g}\) = 248\({}^{\circ}\)), \(J_{mt\_st}\) = 22 A/m\({}^{2}\) (5-frame operation, excepting no. 6; steady state). Summing up, the sixth configuration has an advantage over the other configurations in terms of the 10% smaller critical zone in front of the dam and is practically identical to the results of the fifth configuration. With respect to the fifth configuration, it has slightly worse field results and requires a larger extent of dredging of the corresponding pond and a similar suspension-lifting-positioning system of the electrodes, having the advantage of easier access/lifting due to the non-overlapping frames. Seventh Electrode Station Configuration--Straight Frames in Perimeter Placement to the Protective Dam, Adapting to the Outline of the Pond under Construction  
This configuration is adapted to the topography of the pond under construction, maintaining, in any case, that the straight frame has the characteristics of the basic configuration (\(N_{el\_frame}\) = 13, \(\ell_{p}\) = 0.50 m, \(\ell_{f}\) = 6.00 m). For the case of Korakia, the respective configuration of the electrode station is conducted according to Figure 13. Based on Table 10 in [2], the minimum estimated length \(s_{c}\) is taken as equal to 9.0 m (against the original 8.53 m). The minimum estimated width is equal to \(d_{\_}{fo}\), which is taken as equal to 11.0 m (against the estimated 10.9 m). Therefore, from the application of Equation (39), it follows that the minimum distance between the frames \(ds_{\_}c\) is equal to 11.0 m. If the outline were a \"circle\", then the equal distances between successive frames would be 26.08 m (=(192.5 - 6 \(\times\) 6)/6). However, due to the angles of the formed polygon of Figure 13, after tests, the minimum distances between the frames are chosen equal to 20 m for frames on a straight line, and 19 m for the rest, which is, however, much larger than the \(ds_{\_}c\). Accordingly, for the case of Stachtoroi, the configuration of the electrode station is carried out according to Figure 14. Based on Table 11 in [2], the minimum estimated length \(s_{\_}c\) is taken as equal to 6.0 m (against the original 5.788 m). The minimum estimated width is equal to \(d_{\_}fo\), which is taken to be equal to 8.0 m (against the estimated 7.951 m).