## 3 Electrode Station Configuration
### Eighth Electrode Station Configuration--Straight Frames Adapted to a T-Shaped Protective Dam
* In Figure 29b, regions between the electrode frames are shown, where the electric field strength decreases significantly below 1.25 V/m. However, this does not occur in the area of the frame that has been set out of operation, although it does not exceed the value of 2.28 V/m, which is below 2.5 V/m in all cases; therefore, no issues arise (regarding the safety of the diver) when maintaining the frames. It is pointed out that, especially in the case of non-supply of the fifth frame (due to the mutual negation of electric fields from the neighbouring frames), the electric field strength is below 0.82 V/m. * The developed absolute potentials and the corresponding values of the electrode station resistance, with respect to remote earth, are slightly worse (18.31 kV, 15.69 \(\Omega\)) compared to the first (17.30 kV and 14.82 \(\Omega\) according to Table 15 in [2]) and seventh configurations (17.84 kV and 15.29 \(\Omega\) according to Table 6), while they are better compared to all other configurations. * In field behaviour results, there are no longer similarities in the case of single-frame non-operation, due to the asymmetry of the array layout. The 1 st, 4 th, and 6 th frames of Figure 16 play a critical role in the effect outside the dam, since, when one of them is not loaded, the critical zone outside the dam increases significantly. Summing up, the eighth configuration has an advantage over the other configurations (except for the seventh) as it significantly improves the field results and, most importantly, presents no danger to the diver during the maintenance of the unpowered frame under full-load conditions of the electrode station. However, in relation to the seventh configuration, it presents fewer requirements for dredging operations in the entire pond and does not require dredging and embankment on the shoreline, but the issue of concrete or caisson breakwater formation and quay walls inside the pond remains (compared to configurations 1 through 6). Ninth Electrode Station Configuration--Straight Frames Adapted Radially to a Central Base with Guides  
This configuration uses the standard straight frame of the basic configuration (\(N_{el\_fnume}=13\), \(\ell_{p}=0.50\) m, \(\ell_{f}=6.00\) m). For the case of Korakia, the minimum distance between the frames \(ds_{c}\) has already been calculated equal to 11.0 m, according to Equation (39), while for the case of Stachtoroi, it is equal to 8.0 m. From the respective simulation, the results of Table 8 are obtained, where the respective parameters of Table 6 are listed, having as an additional element the absolute potential on the beginning of the axes O \(V_{O}\). It is pointed out that the maximum absolute potential \(V_{rel\_max}\) is calculated for \(y\), in which the maximum value of all \(V_{max}(y)\) occurs, where each one has resulted from its respective integration (along a semi-axis parallel to Ox). Additionally, in the present cases, the boundaries of the canvas have been extended significantly (e.g., in the near-field at Korakia, it is 140 m \(\times\) 140 m, and at Stachtoroi, it is 120 m \(\times\) 120 m). In addition, various outer \(R_{\mathrm{K1}}\) and inner \(R_{\mathrm{1}}\) central base radii are examined. Indicatively, Figure 30 shows the electric field strength and the region of developing electric field strength greater than 1.25 V/m for the most unfavourable scenario of Korakia, with five frames operating (except for the sixth frame, under maintenance conditions). From the study of the results for the region of Korakia, the following emerges:  
* The length of the critical zone, from the centre of the arrangement, reaches up to 58.26 m in all directions depending on the way of uneven loading of the station. Proper placement of the array at the 12.0 m isobath ensures that its centre will be more than 60 m from land, and a slight dredging will ensure that the frames will be at a depth of more than 10 m, ensuring they are kept away from breaking wave water.