Substrate Controls on the Life-Time Performance of Marine HV Cables
The power transfer performance of HV cables is limited by the ability of a cable to dissipate heat, which in turn is controlled by the medium in which the cable is buried. Therefore an understanding of the thermal properties of the burial environment plays a primary role in both the
cable rating and the lifetime performance of the cable. The ability to properly understand and potentially control the mode of heat dissipation in space and time could significantly reduce the Levelised Cost of Electricity. This paper reviews recent numerical and physical modelling approaches
to demonstrate that, in typical seabed sediments, heat dissipation from HV cables is controlled by both convection and conduction and that their relative contribution is determined by the permeability, porosity and thermal conductivity of the sediment. It presents a new database for these
key measurements from saturated continental shelf sediments allowing the testing of conventional empirical relationships. Finally, it will present new approaches to both the imaging and quantitative analysis of high resolution seismic data to establish the spatial variation in these key sediment
characteristics. This work has significant implications for both windfarm cables and HVDC marine inter-connectors.
Document Type: Research Article
Affiliations: 1: Ocean and Earth Science, University of Southampton, UK 2: Marine Geosciences, National Oceanography Centre Southampton, UK
Publication date: 01 January 2017
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