Cristin-resultat-ID: 1915878
Sist endret: 15. juni 2021, 14:19
NVI-rapporteringsår: 2021
Resultat
Vitenskapelig artikkel
2021

Plastic Deformations of the Sheaths of Mass-Impregnated HVDC Cables and their Effect on the Internal Pressure

Bidragsytere:
  • Magne Runde
  • Svein Magne Hellesø
  • Erik Jonsson og
  • Niklas Magnusson

Tidsskrift

CIGRE Science and Engineering
e-ISSN 2426-1335
NVI-nivå 1

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2021
Publisert online: 2021
Trykket: 2021
Volum: 21
Sider: 14 - 25

Beskrivelse Beskrivelse

Tittel

Plastic Deformations of the Sheaths of Mass-Impregnated HVDC Cables and their Effect on the Internal Pressure

Sammendrag

Thermal expansion and contraction of the impregnation oil (the “mass”) in mass-impregnated non-draining HVDC cables cause the internal pressure to vary greatly during load changes. Pressure drops after load turn-off is a concern since formation of shrinkage cavities may reduce the dielectric strength. To study the pressure dynamics of the insulation system, short cable samples were equipped with sensors measuring the pressure at the innermost and outermost insulation layers, and with strain gauges on the lead sheath and steel bands. The cable temperature and internal pressure were stepped up and down, while recording pressures and strains. It was found that the internal pressure is not only determined by thermal contraction/expansion of the insulation interacting with elastic compressive forces generated by the steel bands. Plastic deformations of the sheaths surrounding the insulation also contribute significantly. The plastic deformation progresses slowly (over weeks and months). Consequently, when considering the dynamic behavior of the insulation system of such cables, and when assessing what operating conditions the cable can safely handle, this phenomenon must be included in the evaluations. It is not sufficient to look at the loading history solely from temperature and space charge redistribution perspectives.

Bidragsytere

Magne Eystein Runde

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

Svein Magne Hellesø

  • Tilknyttet:
    Forfatter
    ved Elkraftteknologi ved SINTEF Energi AS

Erik Jonsson

  • Tilknyttet:
    Forfatter
    ved Elkraftteknologi ved SINTEF Energi AS

Niklas Magnusson

  • Tilknyttet:
    Forfatter
    ved Elkraftteknologi ved SINTEF Energi AS
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