Theoretical study of inception mechanism and growth of defect-induced damages in XLPE cable

Author

Serra, S. ; Montanari, G.C. ; Mazzanti, G.

Author_Institution

Pirelli Labs-Materials Innovations, Milan, Italy

fYear

2001

fDate

2001

Firstpage

644

Lastpage

647

Abstract

We have investigated theoretically the inception mechanism and growth of the damage inside a cable in working conditions. We focused, in particular, our attention to the inception points originated from microscopic defects like voids. In order to clarify the implication of these defects with the failure and breakdown of cables, we have developed a theoretical model based on the theory of electrical breakdown solving numerically its basic equations. Calculations of the ionization rates of atmospheric gas filling the voids have been done as a function of the applied electric stress and void dimensions. Estimates of the energy release and local damages produced by hot electrons are given. A model of growth of damage is also proposed

Keywords

Townsend discharge; XLPE insulation; avalanche breakdown; electric breakdown; noncrystalline defects; power cable insulation; XLPE cable; applied electric stress; atmospheric gas; cable breakdown; cable failure; defect-induced damage growth; electrical breakdown; energy release; hot electrons; inception mechanism; inception points; ionization rates; local damage; void dimensions; voids; Atmospheric modeling; Cables; Electric breakdown; Electrons; Employee welfare; Equations; Filling; Ionization; Microscopy; Stress;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 2001 Annual Report. Conference on

Conference_Location

Kitchener, Ont.

Print_ISBN

0-7803-7053-8

Type

conf

DOI

10.1109/CEIDP.2001.963626

Filename

963626