Effect of cavity sub-corona current on polymer insulation life

Author

Bruning, A.M. ; Kasture, D.G. ; Campbell, F.J. ; Turner, N.H.

Author_Institution

Lectromech. Design Co., Herndon, VA, USA

Volume

26

Issue

4

fYear

1991

fDate

8/1/1991 12:00:00 AM

Firstpage

826

Lastpage

836

Abstract

Calculations and experiments applying voltage to a test cell simulating a high-resistance conducting path in series with a cavity in polyethylene are discussed. These experiments generated chemical changes on the surface wall of the cavities for both subcorona currents (currents produced by voltage below critical inception voltage) and corona currents in different cavities. X-ray photoelectron spectroscopy (XPS) spectra of the cavity surface chemical species indicate similar moieties (functional groups), implying that subcorona current or discharge causes failures similar to corona insulation failures. The longer time for the subcorona species to develop is consistent with field failure occurrence within a few months to a few years. Electric field conditions favorable to the existence of subcorona currents at relatively low voltage are developed

Keywords

X-ray photoelectron spectra; electric breakdown of solids; organic insulating materials; polymers; XPS; cavity sub-corona current; cavity surface chemical species; discharge; field failure; high-resistance conducting path; polyethylene; polymer insulation life; Chemicals; Corona; Geometry; Insulation life; Partial discharges; Plastic insulation; Polymers; Surface discharges; Surface morphology; Voltage;

fLanguage

English

Journal_Title

Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

0018-9367

Type

jour

DOI

10.1109/14.83709

Filename

83709