Effect of the insulator size on the breakdown strength

Author

Damamme, G. ; Gressus, C. Le

Author_Institution

Centre d´´Etudes de Bruyeres-le-Chatel, France

Volume

1

fYear

1997

fDate

19-22, Oct 1997

Firstpage

92

Abstract

The effect of the specimen size (S) on the dielectric strength E _Bb is a well known effect that exists whatever the breakdown type: pure vacuum, flashover, bulk breakdown. Eb varies as S^-n. S can be the insulator surface in case of flashover or the insulator thickness in case of bulk breakdown. This relation has received a statistical justification (weak links) and also has been explained from trapping-detrapping phenomena. n is often found to be equal to 0,5 but they are many results proving that n depends on the material. The work will review experiments on polymers and on ceramics. Considering the technological importance of this parameter for designing an insulating system, it will be suggested that n has to be extracted from Space Charge Measurements

Keywords

electric breakdown; electric strength; flashover; insulation; breakdown strength; bulk breakdown; ceramic; flashover; insulator size; polymer; space charge; trapping-detrapping; vacuum breakdown; weak link; Ceramics; Current measurement; Dielectric breakdown; Dielectrics and electrical insulation; Electric breakdown; Flashover; Polymers; Space charge; Space technology; Vacuum breakdown;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 1997. IEEE 1997 Annual Report., Conference on

Conference_Location

Minneapolis, MN

Print_ISBN

0-7803-3851-0

Type

conf

DOI

10.1109/CEIDP.1997.634566

Filename

634566