Laboratory Results from Dielectric Spectroscopy of Field Aged XLPE Cables with Respect to Water Trees

Kenneth Pedersen, Howard Sedding, Mark Fenger, Mogens Henriksen, Joachim Holbøll

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    This paper deals with the application of frequency domain dielectric spectroscopy for the detection of water trees in XLPE cables. During the research, dielectric spectroscopy measurements have been carried out on cable samples with and without water trees while it was attempted to preserve many of the uncertainties present in the field. The experiments support the applicability of a high voltage test developed primarily at KTH in Sweden, which utilizes the nonlinearity of the dissipation factor. Subsequently it was investigated whether this high voltage method also seems reliable at low voltages. It turned out that the fundamentals of the high voltage method were not directly applicable at low voltages as the nonlinearity of the permittivity is not noticeable at low voltages, at least compared to the deviations. Instead a novel method for interpreting the low frequency measurements is proposed though it needs further verification. Finally a theoretically possible modification of the measurement system is proposed, which deals with the problem of a limited current capability of the amplifier.
    Original languageEnglish
    Title of host publicationIEEE International Symposium on Electrical Insulation 2006
    Publication date2006
    ISBN (Print)1-4244-0333-2
    Publication statusPublished - 2006
    Event2006 IEEE International Symposium on Electrical Insulation - Toronto, Canada
    Duration: 11 Jun 200614 Jun 2006


    Conference2006 IEEE International Symposium on Electrical Insulation
    Internet address

    Bibliographical note

    Copyright: 2006 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE


    • XLPE
    • Water treeing
    • condition assessment
    • Cables


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