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

Author

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

Author_Institution

Musashi Inst. of Technol., Tokyo, Japan

Volume

8

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

78

Lastpage

81

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 distributions 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 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

Keywords

XLPE insulation; charge measurement; insulation testing; power cable insulation; space charge; trees (electrical); 25 year; 6.6 V; DC stress; aged XLPE cable; optical microscopy; pulsed electroacoustic method; radial distributions; service-aged coaxial cable; sliced insulating wall cross section; space charge distribution; water tree diagnosis; water-tree location; Aging; Charge measurement; Coaxial cables; Current measurement; Optical microscopy; Polyethylene; Power cable insulation; Power cables; Space charge; Trees - insulation;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.910428

Filename

910428