Electrical treeing and breakdown of mechanically strained XLPE cable insulation

Author

Ildstad, E. ; Hagen, S.T.

Author_Institution

Norwegian Inst. of Technol., Trondheim, Norway

fYear

1992

fDate

7-10 Jun 1992

Firstpage

135

Lastpage

139

Abstract

The authors describe experiments which have been designed to study the effect of mechanical strain on the short-term AC breakdown strength of cross-linked polyethylene (XLPE) cable insulation. Laboratory experiments were performed on mechanically stressed Rogowski-type test objects and on sharply bent samples of 12-kV XLPE cables. It was verified that introduction of strain significantly reduced the short-term AC breakdown strength of XLPE insulation. By application of 21% strain the breakdown field strength was reduced to 77% of that of nonstrained test objects. In testing 3-m-long cable samples bent to a maximum outer strain of 15%, the 63% breakdown voltage was reduced to 70% of that of an equal length of straight cable

Keywords

ageing; cable insulation; cable testing; electric breakdown of solids; electric strength; insulation testing; organic insulating materials; polymers; stress-strain relations; 12 kV; 3 m; XLPE cable insulation; ageing; breakdown field strength; breakdown voltage; cable testing; cross-linked polyethylene cable; electrical treeing; mechanical strain; mechanically stressed Rogowski-type test objects; short-term AC breakdown strength; stress-strain curves; Aging; Cable insulation; Capacitive sensors; Dielectrics and electrical insulation; Electric breakdown; Plastic insulation; Polymers; Stress; Testing; Trees - insulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation, Conference Record of the 1992 IEEE International Symposium on

Conference_Location

Baltimore, MD

ISSN

1089-084X

Print_ISBN

0-7803-0649-X

Type

conf

DOI

10.1109/ELINSL.1992.247035

Filename

247035