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, Y. 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 Dec 1

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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