Experimental investigation on the cause of harmfulness of the blue water tree to XLPE cable insulation

G. Katsuta, A. Toya, Ying Li, M. Okashita, F. Aida, Y. Ebinuma, Yoshimichi Ohki

    Research output: Contribution to journalArticle

    11 Citations (Scopus)

    Abstract

    Through investigations made on crosslinked polyethylene (XLPE) insulated power cables that had experienced failures, blue-colored water trees were observed in addition to ordinary white water trees. The blue water tree was found to be much more harmful than the white water tree, since more electrical trees started at the blue trees. Elemental analysis revealed that iron and sulfur exist in the blue tree. In the case of this blue water tree, space charge exists abundantly but only at the tree tip, while no charge signal is observed on the electrode from which the tree starts. This indicates that the conductivity of the blue tree is very high. This is considered to be the main reason of the harmfulness of this tree.

    Original languageEnglish
    Pages (from-to)887-891
    Number of pages5
    JournalIEEE Transactions on Dielectrics and Electrical Insulation
    Volume6
    Issue number6
    DOIs
    Publication statusPublished - 1999

    Fingerprint

    Insulation
    Cables
    Water
    Electric space charge
    Polyethylenes
    Sulfur
    Iron
    Electrodes
    Chemical analysis

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

    Cite this

    Experimental investigation on the cause of harmfulness of the blue water tree to XLPE cable insulation. / Katsuta, G.; Toya, A.; Li, Ying; Okashita, M.; Aida, F.; Ebinuma, Y.; Ohki, Yoshimichi.

    In: IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 6, No. 6, 1999, p. 887-891.

    Research output: Contribution to journalArticle

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