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Proceedings Paper

Surface charging and flashover of insulators in vacuum
Author(s): I. D. Chalmers; J. H. Lei; B. Yang
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Paper Abstract

Investigations have been carried out on right cylindrical teflon spacers in vacuum under DC stress to study the effect of cathode geometry on surface charging and flashover. Three cathode support arrangements were used. Type I involved a recess in the cathode into which the spacer was located. Type II was a simple flat plate cathode while type III had a raised insert on the cathode surface over which the spacer was located. In all cases the surface charge density and distribution is primarily dependent upon the magnitude of the electric area. Using the type I arrangement inception for charge deposition was always about 10 kV even when the spacer had been subjected to repeated flashovers and at applied voltages greater than this the density of the charge, which was fairly uniformly-distributed around the surface, was more or less proportional to the applied voltage. For the type II and III arrangements, a distinct, uniformly-distributed negative charge of up to 20 (mu) C/m2 was always detected at low values of applied stress and at a fairly well defined transition voltage this gave way to a distribution which was substantially uniform in the case of type II but quite filamentary in type III and both involved the deposition of positive charge.

Paper Details

Date Published: 1 May 1994
PDF: 4 pages
Proc. SPIE 2259, XVI International Symposium on Discharges and Electrical Insulation in Vacuum, (1 May 1994); doi: 10.1117/12.174670
Show Author Affiliations
I. D. Chalmers, Univ. of Strathclyde (United Kingdom)
J. H. Lei, Univ. of Strathclyde (United Kingdom)
B. Yang, Univ. of Strathclyde (United Kingdom)


Published in SPIE Proceedings Vol. 2259:
XVI International Symposium on Discharges and Electrical Insulation in Vacuum
Gennady A. Mesyats, Editor(s)

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