Correlation between space charge distribution and water-tree location in aged XLPE cable

K. Suzuki, Y. Tanaka, T. Takada, Yoshimichi Ohki, C. Takeya

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    Abstract

    The correlation between charge distribution in an aged crosslinked polyethylene (XLPE) cable and the location of water trees has been studied. The space charge radial distribution at different angle in the insulating wall of a service-aged XLPE coaxial cable, induced by application of a dc stress, were measured using the pulsed electroacoustic (PEA) method. Furthermore, a cross section of sliced insulating wall was observed with an optical microscope to compare with the radial space charge distribution. The cable under investigation was electrically aged in service at 6.6 kV ac for 25 years in wet conditions. Water trees were found at the position in which space charge was observed. On the other hand, no water tree was found at the position in which the space charge was not observed. Judging from these results, the space charge measurement seems to be useful for the diagnosis of water trees in aged cables.

    Original languageEnglish
    Pages (from-to)78-81
    Number of pages4
    JournalIEEE Transactions on Dielectrics and Electrical Insulation
    Volume8
    Issue number1
    DOIs
    Publication statusPublished - 2001 Feb

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    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

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