In HVDC submarine cable connections, electrodes design is paramount for technical and economic feasibility. The cathode is designed as simple as possible, if bidirectional operations are not required since reduction reactions does not produce corrosion of the material. The situation is completed reversed for the anodes submersed in seawater: in this case, the corrosion mechanism provokes removal of surface material.
The existing Sardinia-Corsica-Italy (SaCoI) multiterminal HVDC link, commissioned in 1990, will be refurbished by Terna in the next years, due to ageing and technological obsolescence. The possible technical solutions were investigated by Terna and Sapienza University. The paper deals with the comparison of three alternative solutions for the SaCoI, using either direct current or alternating current: results evidence that both alternatives are theoretically feasible, although with different advantages and disadvantages.
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