A study of the effect of electrical breakdown in dielectric liquids on the needle point structure

Author

Patrissi, S. ; Pompili, M. ; Yamashita, H. ; Forster, E.O.

Author_Institution

Electr. Eng. Dept., Univ. of Rome La Sapienza, Italy

fYear

1993

fDate

19-23 Jul 1993

Firstpage

376

Lastpage

382

Abstract

It has been suggested that the radius of curvature of needle point influences the electrical breakdown process. Optical microscope studies of the effect of consecutive breakdowns on the shape of steel needles in dielectric liquids have been performed under carefully controlled conditions to learn more about the influence of the radius of curvature on the breakdown process. It is shown that a considerable loss of metal accompanies each breakdown, which causes changes in the overall shape of the needle point. The size reduction of the needle is attributed to the intense local heating occurring during breakdown and possible chemical effects

Keywords

electric breakdown; chemical effects; curvature; dielectric liquids; electrical breakdown; intense local heating; needle point structure; needle size; optical microscopy; steel needles; Dielectric breakdown; Dielectric liquids; Electric breakdown; Heating; Needles; Optical control; Optical losses; Optical microscopy; Shape control; Steel;

fLanguage

English

Publisher

ieee

Conference_Titel

Conduction and Breakdown in Dielectric Liquids,1993., ICDL '93., IEEE 11th International Conference on

Conference_Location

Baden-Dattwil

Print_ISBN

0-7803-0791-7

Type

conf

DOI

10.1109/ICDL.1993.593971

Filename

593971