June 22, 2025

Insights on the Fatigue-Limit-State Assessments of HVDC Cable Bundles

TGTerry GriffithsThe University of Western Australia YTYunfei TengÉcole Polytechnique Fédérale de Lausanne JJJack JorgensenThe University of Western Australia

Key Points

Fatigue damage in HVDC cable bundles can be significantly reduced by optimizing VIV response reduction and damping ratio effects.
Zhu’s model was shown to outperform DNV’s model for very long spans, enhancing fatigue limit assessments in HVDC cables.
The study analyzed the natural frequency and sag effects on single spans of HVDC cable configurations, including conductors and fiber optic cables.
Findings indicate that proper adjustments to VIV response and damping can improve the longevity and reliability of HVDC cable systems.

Abstract

Abstract The fatigue limit state (FLS) of High-Voltage Direct Current (HVDC) cable bundles, in a configuration comprising two main conductors and a smaller fiber optic/earth cable, is investigated in this paper. Firstly, the effect of static tension and sag on the natural frequency of a single span with pinned-pinned end conditions is examined following two approaches recommended by DNV-RP-F105 (2017) and Zhu et al. (2023a), respectively. It is found that Zhu’s model outperforms DNV’s model for very long spans. Secondly, the FLS of a cable bundle is assessed for the lead sheath considering the reduction of VIV response amplitudes and the potential increase of damping ratio. Results show that the fatigue damage of a cable bundle can be significantly reduced when proper values of the VIV response reduction and the increase of damping ratio are considered.

Ask AI

Helpful

Bookmark

View Full Paper