The Mitigation of Interference on Underground Power Lines Caused by the HVDC Electrode

Massimo Brignone, Daniele Mestriner (), Paolo Molfino, Mario Nervi, Massimo Marzinotto and Sino Patti
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Massimo Brignone: Electrical, Electronics and Telecommunication Engineering and Naval Architecture Department, University of Genoa, Via All’Opera Pia 11, 16145 Genoa, Italy
Daniele Mestriner: Electrical, Electronics and Telecommunication Engineering and Naval Architecture Department, University of Genoa, Via All’Opera Pia 11, 16145 Genoa, Italy
Paolo Molfino: Electrical, Electronics and Telecommunication Engineering and Naval Architecture Department, University of Genoa, Via All’Opera Pia 11, 16145 Genoa, Italy
Mario Nervi: Electrical, Electronics and Telecommunication Engineering and Naval Architecture Department, University of Genoa, Via All’Opera Pia 11, 16145 Genoa, Italy
Massimo Marzinotto: TERNA S.p.A., 00185 Roma, Italy
Sino Patti: TERNA S.p.A., 00185 Roma, Italy

Energies, 2023, vol. 16, issue 23, 1-10

Abstract: High Voltage Direct Current power links are usually designed to adopt, on a continuous basis or during emergency operations, two grounding plants using the soil or seawater as a link–current return path. Such DCs flowing into the ground can cause problems, of which one of the most important is the increased risk of the corrosion of metallic structures in the area. Normally, the simplest mitigation technique is to keep an adequate distance between the main grounding plants and any metallic structure that can be corroded. Normally, such distances are not less than 5 km. However, there are situations where this approach cannot be applied, for example due to geographical constraints. In this paper, we describe and analyze the behavior of a mitigation technique that can be adopted when the HV pole cable is laid closer than the recommended distance to the main ground electrode. This paper is focused on the minimization of deleterious effects on the cable’s metallic sheath and its earthing points, distributed along it by means of sheath segmentation. The suggested approach appears well-suited to substantially diminishing the current flowing through the sheath of an HVDC power cable. In the segmented scenario, the sheath’s power dissipation is less than one-hundredth of that in the typical continuous configuration.

Keywords: HVDC transmission; grounding; cable shielding; corrosion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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