Examination of the risk of flash X-ray induced breakdown in pressurised electrical enclosures

Author

Pigneret, J.

Author_Institution

Nucletudes SA, Les Ulis, France

fYear

1991

fDate

9-12 Sep 1991

Firstpage

548

Lastpage

552

Abstract

Disruptive breakdown in gas triggered by flash X-rays is studied. For relevant electrode geometries found in electrical and electronic boxes, filled with air, nitrogen or SF₆ under a pressure between 1 and 1000 millibars, is noticed a drop in the breakdown threshold voltage when the dose rate is higher than 1E8 rad (Si)/s. The maximum drop appears at about 1E10 rad (Si)/s but is never higher than half of the static BV. For higher dose rates (1E11-1E12) the breakdown voltage tends to increase, due to the higher charge density created in the gas, which precludes to the filament formation. The impact of solid dielectrics on the phenomena is evaluated, and a protection strategy is proposed

Keywords

X-ray effects; electric breakdown of gases; gaseous insulation; 1 to 1000 mbar; N₂; SF₆; air; breakdown threshold voltage; disruptive breakdown; dose rate; flash X-ray induced breakdown; gas breakdown; pressurised electrical enclosures; protection strategy; solid dielectrics; Breakdown voltage; Electric breakdown; Electrodes; Geometry; Nitrogen; Polarization; Protection; Solids; Sulfur hexafluoride; Threshold voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Radiation and its Effects on Devices and Systems, 1991. RADECS 91., First European Conference on

Conference_Location

La Grande-Motte

Print_ISBN

0-7803-0208-7

Type

conf

DOI

10.1109/RADECS.1991.213531

Filename

213531