The impacts of degassing on space charge characteristics and DC conductivity in semicon-bonded XLPE for HVDC cable applications

M. Hao, Adnan Fazal, A. S. Vaughan, G. Chen, Y. Zhou, C. Zhang

Research output: Chapter in Book/Report/Conference proceedingConference proceeding

11 Citations (Scopus)

Abstract

High voltage direct current (HVDC) cables are one of the key components for the HVDC power transmission system. HVDC cables for higher voltage level, larger power capacity and higher reliability are still desired for the power industry as part of a global power strategy. One of the major concerns related to HVDC applications is the presence of space charge within the dielectrics, which distorts the electric field distribution and contributes to accelerated ageing and consequent failure of the cable insulation. The byproducts generated from the crosslinking process during the manufacture of XLPE insulation for HVDC cable are one of the major sources of hetero-charge formation in dielectrics. Therefore, degassing is widely applied in cable manufacture for the removal of such crosslinking byproducts. In this paper, composite XLPE samples were produced that include two layers of semiconductive polymer (semicon), which are thermally bonded on the top and bottom of the XLPE insulation, to mimic a real cable manufacturing process. The samples were degassed under vacuum and elevated temperature for 1, 3 and 6 days and their space charge characteristics and conductivities were then measured at an applied field of 40 kV/mm. The influence of the degassing period and the semicon material formulation on space charge formation and distribution in the system are discussed and the findings are compared with undegassed samples.
Original languageEnglish
Title of host publication2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)
Place of PublicationCanada
PublisherIEEE
Pages97-100
Number of pages4
ISBN (Electronic)978-1-5090-4655-3
ISBN (Print)978-1-5090-4654-6, 978-1-5090-4653-9
DOIs
Publication statusPublished - 19 Dec 2016
EventIEEE Conference on Electrical Insulation and Dielectric Phenomena - Toronto, Canada
Duration: 16 Oct 201619 Oct 2016

Conference

ConferenceIEEE Conference on Electrical Insulation and Dielectric Phenomena
Abbreviated titleCEIDP
CountryCanada
CityToronto
Period16/10/1619/10/16

Keywords

  • Space charge
  • Conductivity
  • HVDC transmission
  • Power cables
  • Cathodes
  • Anodes
  • XLPE insulation
  • deaeration
  • HVDC power transmission
  • power cable insulation
  • space charge
  • space charge formation
  • high voltage direct current cables
  • HVDC cables
  • HVDC power transmission system
  • electric field distribution
  • accelerated ageing
  • cable insulation failure
  • hetero-charge formation
  • degassing
  • crosslinking byproducts
  • composite XLPE samples
  • semiconductive polymer
  • semicon material formulation
  • conductivity
  • PEA
  • XLPE
  • HVDC cable
  • semiconductiing material
  • charge injection

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  • Cite this

    Hao, M., Fazal, A., Vaughan, A. S., Chen, G., Zhou, Y., & Zhang, C. (2016). The impacts of degassing on space charge characteristics and DC conductivity in semicon-bonded XLPE for HVDC cable applications. In 2016 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) (pp. 97-100). Canada: IEEE. https://doi.org/10.1109/CEIDP.2016.7785533