Predicting failure of dynamic subsea cables by electrical insulation breakdown due to water treeing

• The study presents numerical models and a methodology that can be used to study and simulate the growth of water trees in the insulation materials under a combination of cyclic electrical stresses and mechanical stresses (cable motions-induced). A fracture-mechanics-based model is presented that combines the effect of these stresses to determine the growth rate of water tree defects and the service life of the insulation materials around a conductor. A study case with two dynamic power cables installed between a wave energy converter and a hub is used to demonstrate the methodology for different sea state conditions. The results show that the cable fails significantly earlier when motion-induced mechanical stresses and electrical stresses are taken into account compared to when only the mechanical stresses were considered. A sensitivity analysis for selected material parameters is also presented to highlight the factors that significantly influence the cable service life prediction.

Ämnesord

TEKNIK OCH TEKNOLOGIER  -- Materialteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Naturresursteknik -- Marin teknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Environmental Engineering -- Marine Engineering (hsv//eng)

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik -- Annan elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering -- Other Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Nyckelord

wave energy

dynamic cables

fatigue

cable dynamics

water tree

Publikations- och innehållstyp

kon (ämneskategori)

ref (ämneskategori)