Title :
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
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;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1988. Proceedings., Second International Conference on Properties and Applications of
Conference_Location :
Beijing
DOI :
10.1109/ICPADM.1988.38431
