## 3 Electrode Station Configuration
### General Remarks
In the case of Korakia, the distance between the frames \(d_{fp}\) along yOy/ is 10.9 m, with the consequence that the total necessary estimated length of protective dam \(\ell_{st-II}\), behind which the arrangement will be placed, is 77.0 m (of which 3.5 m, on each outer side, can be considered as on the shore). Accordingly, for the case of Stachtoroi, the distance between the frames \(d_{fp}\) along the yOy/ axis is 8.0 m, with the consequence that the total necessary estimated length of protective dam \(\ell_{st-II}\), behind which the arrangement will be placed, is 56.7 m (of which 3.4 m, on each outer side, can be considered as on the shore). From the respective simulation, the results of Table 1 are obtained. Indicatively, Figure 22 shows the electric field strength and the area of developing electric field strength greater than 1.25 V/m, for the worst-case scenario of the Korakia area, with five frames operating (one of the two extreme ones out of operation, under maintenance conditions). From the study of the respective results, for the area of Korakia, the following emerges:  
* The deviation at the extremes of the array reaches up to 27.3 m, depending on the loading method (especially when the five frames are loaded consecutively). However, in the area of the non-operating frame, the electric field strength rises slightly over 2.5 V/m; therefore, no issues arise (regarding safety) when maintaining the frames, provided the diver has taken the appropriate measures. * The deviation in the maximum developing electric field strength of the electrode station, compared to a single frame (24.98 V/m against 24.06 V/m, according to Table 10 in [2]), is of the order of 3.8%, which is limited and smaller than that of the first configuration  
(24.98 V/m versus 26.09 V/m of Table 12 in [2]). However, the necessary distances are observed here. * The critical zone of the dam extends beyond it by 42.7 m on the outer side (with a crest width of 5 m and a suspension distance of at least 1 m) along the xOx/ axis (perpendicular to the dam), which is slightly better than that of the first configuration (against 44.3 m). * The critical zone of the dam extends beyond it by 62 m (i.e., 31 m on either side) along the yOy/ axis (parallel to the dam axis) in the coastal area. This is partly due to the fact that the initially estimated required length of the assumed electrode station is 77.0 m (along the yOy/ axis), the corresponding actual required length is 131.5 m (from the results of the superposition model, according to Table 1), while the available length is only 70 m.
* The developed absolute potentials and the corresponding values of the electrode station resistance, with respect to remote earth, are slightly better (22.48 kV, 19.26 \(\Omega\)) compared to the initial configuration (22.77 kV and 19.5 \(\Omega\), according to Table 15 in [2]). Figure 22: (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 2 nd configuration in the area of Korakia (\(\rho_{S}=\infty\), without dam, \(\rho_{w}=0.25\)\(\Omega\)-m, \(\ell_{p}=0.50\) m, \(d_{\ell p}=10.90\) m, \(L=2.13\) m, \(\theta_{S}=248^{\circ}\)), \(J_{mt,st}=22\) A/m\({}^{2}\) (5-frame operation, excepting no. 6; steady state). From the study of the respective results, for the area of Stachtoroi, the following emerges:  
* The deviation at the extremes of the array reaches up to 20.6 m, depending on the loading method (especially when the five frames are loaded consecutively). However, in the area of the non-operating frame, the electric field strength rises slightly over 2.5 V/m; therefore, no issues arise (regarding safety) when maintaining the frames, provided the diver has taken the appropriate measures.