Cristin-resultat-ID: 1702275
Sist endret: 18. juni 2019, 15:46
NVI-rapporteringsår: 2019
Resultat
Vitenskapelig artikkel
2019

Cavities in mass-impregnated HVDC subsea cables studied by AC partial discharge measurements

Bidragsytere:
  • Magne Runde
  • Oddgeir Kvien
  • Horst H. Førster og
  • Niklas Magnusson

Tidsskrift

IEEE transactions on dielectrics and electrical insulation
ISSN 1070-9878
e-ISSN 1558-4135
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2019
Publisert online: 2019
Trykket: 2019
Volum: 26
Hefte: 3
Sider: 913 - 921
Open Access

Importkilder

Scopus-ID: 2-s2.0-85066506527

Beskrivelse Beskrivelse

Tittel

Cavities in mass-impregnated HVDC subsea cables studied by AC partial discharge measurements

Sammendrag

Partial discharge measurements have been used for studying shrinkage voids in the insulation of mass-impregnated high voltage DC subsea power cables. Three 4.5-m long cable samples were subjected to ac partial discharge measurements at different ambient temperatures, both under isothermal conditions and after load current turnoffs. Two distinctly different phase resolved partial discharge patterns were observed, suggesting that two different "types" of cavities were created. The type causing by far the most powerful discharges appeared a few hours into the cooling period after load turn-off, which coincides in time with when load cycling breakdowns during type testing usually occur. Current loading has a significant effect on the cavities, as it leaves them – at least temporary – with a different dielectric strength afterwards. The mechanisms behind this change are not identified, but the associated time constants are of the order of days and weeks. Consequently, accurately determining the limitations of such cables with regard to their ability to withstand polarity reversals and rapid load changes may be more complicated than previously assumed.

Bidragsytere

Magne Eystein Runde

Bidragsyterens navn vises på dette resultatet som Magne Runde
  • Tilknyttet:
    Forfatter
    ved Elkraftteknologi ved SINTEF Energi AS

Oddgeir Kvien

  • Tilknyttet:
    Forfatter
    ved Elkraftteknologi ved SINTEF Energi AS

Horst H. Førster

  • Tilknyttet:
    Forfatter
    ved Elkraftteknologi ved SINTEF Energi AS

Niklas Magnusson

  • Tilknyttet:
    Forfatter
    ved Elkraftteknologi ved SINTEF Energi AS
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