## 3 Electrode Station Configuration
### General Remarks
Although the initially estimated required length of the assumed electrode station is 33.4 m (along the yOy/ axis), the corresponding actual required length is 86.7 m (from the results of the superposition model, in Table 4), 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 (20.35 kV, 17.43 \(\Omega\)) 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) and slightly better compared to the third (21.48 kV and 18.40 \(\Omega\) according to Table 2) and fourth (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, among the 1 st, 2 nd, 5 th, and 6 th frames, 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 variation since the integration is always carried out on the Ox semi-axis. Summing up, the fifth configuration has an advantage over the other configurations, in terms of the 10% smaller critical zone in front of the dam. However, there are no significant improvements in developing absolute potentials and respective electrode station resistance values (with respect to remote earth). In addition, it has much greater demands regarding the suspension-lifting-positioning systems of the electrodes, as well as the greater extent of dredging of the respective pond, compared to the first configuration. Sixth Electrode Station Configuration--Straight Frames in Two Successive Rows, Each Vertical to the Longitudinal Axis of the Dam and Non-Overlapping on the Vertical One  
The respective configuration of the electrode station is according to Figure 10, where the straight frame has the characteristics of the basic configuration (\(N_{\ell,frame}\) = 13, \(\ell_{p}\) = 0.50 m, \(\ell_{f}\) = 6.00 m). In the case of Korakia, the distance between the two rows (on the xOx/) is equal to \(s_{c}\), which is taken here as equal to 9.0 m (against the estimated 8.53 m according to Table 10 in [2]); consequently, the total width according to Equation (36) will be 21.0 m. The distance between the frames (on the yOy/ axis) is equal to \(d_{fp}\), which is taken here as equal to 11.0 m (against the estimated 10.9 m according to Table 10 in [2]) due to length availability; thus, the total necessary estimated length of the protective dam (behind which the arrangement will be placed) according to Equation (38) will be equal to 49.866 m. Accordingly, for the case of Stachtoroi, the distance between the two rows (on the xOx/ axis) is equal to \(s_{c}\), which is taken here as equal to 6.0 m (against the estimated 5.788 m according to Table 11 in [2]); consequently, the total width according to Equation (36) will be 18.0 m. The distance between the frames (along the yOy/ axis) is equal to \(d_{fp}\), taken here as equal to 8.0 m (against the estimated 7.951 m according to Table 11 in [2]) due to length availability. Therefore, the total necessary estimated length of the protective dam (behind which the arrangement will be placed) according to Equation (38) will be equal to 36.366 m. From the respective simulation, the results of Table 5 are obtained, with the corresponding parameters of Table 2. Indicatively, Figure 26 shows the electric field strength and the area of developing electric field strength greater than 1.25 V/m for the most unfavourable scenario for the area of Korakia, with five frames operating (sixth frame out of operation, under maintenance conditions). From the study of the results for the region of Korakia, the following emerges:  
* The deviation at the extremes of the array (along the yOy\({}^{/}\) axis) reaches up to 33.96 m, and along the xOx\({}^{/}\) axis up to 46.7 m (especially when loading five frames, except for the first or sixth).