The flashover process based on the finding of surface charge distribution on alumina insulator surface in vacuum

Author

Tumiran ; Maeyama, M. ; Imada, H. ; Saito, Y. ; Kobayashi, S.

Author_Institution

Dept. of Electr. Eng., Gadjah Mada Univ., Yogyakarta, Indonesia

Volume

1

fYear

1996

fDate

21-26 Jul 1996

Firstpage

430

Abstract

The measurement of insulator surface charge distribution on the whole area of alumina YSA 998 and alumina UHA 99 surface area after impulse voltage application revealed that the surface charging can be initiated either from the anode or from the cathode triple junction. The charging initiated from the anode triple junction (for positive polarity) produced positive charge at the anode region and the density is dependent on applied voltage, while the charging initiated from the cathode triple junction region (for negative polarity) produced negative charge around the cathode region. For positive polarity, the critical value of charge density to the flashover for alumina YSA 998 and alumina UHA 98 are 5.70 μC/m² and 17.2 μC/m², respectively

Keywords

alumina; charge measurement; electric breakdown; electric strength; flashover; impulse testing; insulator testing; surface charging; vacuum breakdown; vacuum insulation; Al₂O₃; alumina UHA 99; alumina YSA 998; alumina insulator surface; anode triple junction; cathode triple junction; charge density; flashover process; impulse voltage application; insulation breakdown testing; insulator surface charge distribution measurement; surface charging; vacuum; Anodes; Area measurement; Cathodes; Charge measurement; Current measurement; Dielectrics and electrical insulation; Electrodes; Flashover; Surface charging; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Discharges and Electrical Insulation in Vacuum, 1996. Proceedings. ISDEIV., XVIIth International Symposium on

Conference_Location

Berkeley, CA

Print_ISBN

0-7803-2906-6

Type

conf

DOI

10.1109/DEIV.1996.545396

Filename

545396