Influence of insulation morphology, impurities and oxidation on cables electric properties

Author

Crine, Jean-Pierre

Author_Institution

Inst. de Recherche d´´Hydro-Quebec, Varennes, Que., Canada

fYear

1988

fDate

12-16 Sep 1988

Firstpage

451

Abstract

It is shown that the AC breakdown strength and dielectric losses of actual unaged and aged transmission and distribution cables vary with the polyethylene insulation crystallinity, contamination, and oxidation. These effects are especially important close to the conductor shield and they increase with service aging due to impurity diffusion from the heavily contaminated shield and to increased oxidation associated with the `hot´ conductor. This is the region where breakdown and vented water-trees are likely to be initiated. The influence of curing is also discussed

Keywords

ageing; cable insulation; dielectric losses; electric strength; organic insulating materials; polymers; power cables; AC breakdown strength; XLPE; aged cables; breakdown; cables electric properties; conductor shield; contamination; dielectric losses; distribution cables; heavily contaminated shield; impurities; impurity diffusion; influence of curing; insulation crystallinity; insulation morphology; oxidation; polyethylene; service aging; transmission cables; unaged cables; vented water-trees; Aging; Cables; Conductors; Dielectric breakdown; Dielectric losses; Dielectrics and electrical insulation; Impurities; Morphology; Oxidation; Propagation losses;

fLanguage

English

Publisher

ieee

Conference_Titel

Properties and Applications of Dielectric Materials, 1988. Proceedings., Second International Conference on Properties and Applications of

Conference_Location

Beijing

Type

conf

DOI

10.1109/ICPADM.1988.38431

Filename

38431