Summary
This paper is intended to raise awareness of an easily overlooked issue concerning calculating and designing for circulating sheath currents at the terminations of offshore high voltage cable systems. This experience relates to 3 core armoured submarine cables with semiconducting sheath designs. The paper highlights an end-effect which is not well described in standards, but one that can still be readily calculated. Neglecting this end-effect can lead to a non-conservative estimates of the sheath currents seen in real systems. The effect is specifically an issue for semiconducting core sheaths when combined with even a modest phase separation on the offshore substation topsides.
Read more Read lessThis configuration will cause a raised sheath current that will result in higher screen losses in the submarine cable at the approach to the offshore substation as well as higher than expected losses/currents in the grounding connection to the lead sheath which could adversely impact the cable system if not accounted for.
The paper gives examples of the impact of the offshore substation topside layout on the cable and how the semiconducting properties of the core outer sheath/jacket will influence the sheath current. Recommendations for a simple (conservative) calculation technique to capture this phenomenon are given, and the paper describes how to assess this issue in a practical project.
Mitigating actions and future works needed are also suggested. The methods presented will hopefully be relevant as a starting point for future recommendation and standardisation activities.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | B1_12092_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Denmark |
| Study committees | |
| File size | 912 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
KVARTS Thomas - Ørsted Wind Power; GIAGKOU Xenofon - Ørsted Wind Power; PILGRIM James - Ørsted Power; CWIKOWSKI Oliver Nicholas - Ørsted Power; BINNIAN Angus - Ørsted Power
