## 3 Electrode Station Configuration
### 10 th Electrode Station Configuration--Straight Frames Adapted Perimetrically to a Central Base  
The configuration of a central base, with radial placement of the electrode frames, presents the construction problem of the auxiliary guides of the frames, in the form of a cantilever. An alternative approach is to place the electrode frames tangential to the central base, reducing at the same time the requirements of the frame suspension-lifting-positioning system. Of course, in this case too, the requirement applies that the straight frames be placed at such a depth that they are always out of reach of the breaking wave. Figure 19 shows the view of the arrangement of vertical straight frames of length \(\ell_{f}\) in the sea around a central base of a polygon, inscribed in a circle of gross radius \(R_{K2}\) (where gross radius means the radius of the structure, along with the necessary gap \(d_{r1}\), from the construction), which are placed perimetrically and which constitutes the ninth configuration. The upper frame level is at depth \(h_{u}\), which is greater than the depth reached by the breaking wave water, while the seabed is at \(h_{sb}\), which is greater than the sum of the upper frame level \(h_{u}\) and the frame/electrode rod height \(L_{d}\). Accordingly, Figure 20 shows the respective plan view of the proposed arrangement for six electrode frames. The formed angle \(\theta_{f}\) between successive frames (according to Equation (41)) and the minimum distance \(ds_{c}\) (according to Equation (39)) can be seen, as well as the widths \(d_{Ox}\) and \(d_{Ox}\)\({}^{\prime}\) of the critical zone of the electrode station, along the semi-axes Ox and Ox\({}^{\prime}\) from the beginning of the axes (which is the centre of the central base), and the lengths \(d_{Oy}\) and \(d_{Oy}\)\({}^{\prime}\) of the critical zone of the electrode station, along the semi-axes Oy and Oy\({}^{\prime}\) from the beginning of the axes, as obtained from the electrode station simulations. Figure 19: Tenth electrode station configuration—Cross-section of six straight frames, adapted around the perimeter on a central base. Figure 20: Tenth electrode station configuration—Floor plan of six straight frames, adapted around the perimeter of a central base (a total of 6 frames in a dodecagon). With the help of Figure 21, the necessary \"gross\" radius \(R_{K2}\) of the central base is calculated as follows: The \(N_{frame^{\prime}}\) frames are placed in a circle of centre O and radius \(R_{K2}\) in such a way that the edges of each frame lie on this circle, while the frames are distributed per arc of angle \(\theta_{f}\). So, in the present case, without loss of generality, the following apply:  
\[(AB)=(CD)=(EF)=(GH)=(IJ)=(KL)=\ell_{b1}\geq\ell_{f} \tag{44}\]  
\[(BC)=(DF)=(FG)=(HI)=(JK)=(LA)=\ell_{b2}\geq ds_{c} \tag{45}\]  
\[(OA)=(OB)=(OC)=(OD)=(OE)=(OF)=(OG)=(OH)=(OI)=(OJ)=(OK)=(OL)=R_{K2} \tag{46}\]  
However, observing the angles formed in Figure 21, where \(\theta_{1}\) is the arc angle corresponding to any frame and \(\theta_{2}\) is the arc angle corresponding to the distance between two consecutive frames, it follows that:  
\[\theta_{f}=\angle MOR=\angle MOB+\angle BOC+\angle COR=\frac{\theta_{1}}{2}+ \theta_{2}+\frac{\theta_{1}}{2}=\theta_{1}+\theta_{2} \tag{47}\]  
The points M, N, Q, and R are the points of intersection of the respective perpendicular bisectors, which are also bisectors on the isosceles triangles OAB, OBC, OCA, and OCD, respectively. Applying the sine definition in the triangles OBM and OBN, the following result, respectively:  
\[sin(\angle MOB)=sin(\frac{\theta_{1}}{2})=\frac{(BM)}{(OB)}=\frac{\ell_{b1}/2 }{R_{K2}}\Rightarrow\theta_{1}=2\times asin\bigg{(}\frac{\ell_{b1}}{2\times R _{K2}}\bigg{)}\simeq 2\times asin\bigg{(}\frac{\ell_{f}}{2\times R_{K2}} \bigg{)} \tag{48}\]  
Figure 21: Tenth electrode station configuration—Geometric arrangement for calculating the minimum radius of a central base for the placement of six vertical straight frames on its circumference.