Cristin-resultat-ID: 888889
Sist endret: 9. juli 2012, 11:32
NVI-rapporteringsår: 2012
Resultat
Vitenskapelig artikkel
2012

Effects of raw natural gas on the aging of high-voltage electrical machine mainwall insulation

Bidragsytere:
  • Ville Sihvo
  • Arto Pihlajamäki
  • Janne Nerg
  • Sverre Hvidsten
  • Oddgeir Kvien og
  • Lars Brenne

Tidsskrift

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

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2012
Volum: 19
Hefte: 3
Sider: 893 - 902

Importkilder

Isi-ID: 000305606600017
Scopus-ID: 2-s2.0-84862639805

Beskrivelse Beskrivelse

Tittel

Effects of raw natural gas on the aging of high-voltage electrical machine mainwall insulation

Sammendrag

The total recovery of natural gas from subsea wells can be significantly increased with a compressor installed near the wellheads. The compressor is powered by a high-speed induction motor integrated in the same casing. The process gas flows through the motor and acts as a cooling medium. The insulation system of the motor is in direct contact with the gas and must be resistant to it. The gas mixture contains hydrocarbons, water, and monoethylene glycol. The effects of the gas mixture and its individual components on the properties of a high-voltage machine mainwall insulation consisting of mica, glass, and epoxy are obtained by experimental tests with raw natural gas at accelerated conditions. The tests at high pressures and temperatures indicate that heavy hydrocarbon compounds cause similar effects to plasticizers inside the bisphenol A epoxy resin, but such compounds do not penetrate easily into epoxy novolac resin. The plasticizing effect is seen as increased weight and volume, decreased mechanical strength and E-modulus, and reduced glass transition temperature. The polymers did not decompose chemically. The mainwall insulation is vulnerable to delamination, which is initiated by the detachment of glass strains and epoxy resin. Water causes dielectric loss peak at very low frequencies, while the heavy hydrocarbons produce a loss peak in higher frequency range. © 2012 IEEE.

Bidragsytere

Ville Sihvo

  • Tilknyttet:
    Forfatter
    ved Lappeenrannan teknillinen korkeakoulu

Arto Pihlajamäki

  • Tilknyttet:
    Forfatter
    ved Lappeenrannan teknillinen korkeakoulu

Janne Nerg

  • Tilknyttet:
    Forfatter
    ved Lappeenrannan teknillinen korkeakoulu

Sverre Hvidsten

  • Tilknyttet:
    Forfatter
    ved Elkraftteknologi ved SINTEF Energi AS

Oddgeir Kvien

  • Tilknyttet:
    Forfatter
    ved Elkraftteknologi ved SINTEF Energi AS
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