Space charge in XLPE near the electrode interfaces

R. J. Fleming, S. B. Lang, T. Pawlowski

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

Electric field and space charge profiles were measured in 110 μm thick planar XLPE samples machined from the insulation of power transmission cables. The samples carried vacuum-evaporated aluminium electrodes, and were poled at field-strengths around 50 kV/mm (both polarities) for periods up to 48 hr. The electric field and space charge profiles were measured using the LIMM technique. The experimental data were analysed using a combination of the polynomial regularization method (PRM) and the L-curve method (LCM). The profiles were recorded immediately after the end of poling, and after the sample had been grounded for various times. The spatial resolution of the profiles in the thickness direction was 1-2 μm. Negative space charge densities up to 400 C m-3 and negative field strengths up to 20 kV/mm were recorded at distances 1-2 μm from the cathode immediately after poling. Within similar distances of the anode the corresponding figures were +300 to -100 C m -3 and -5 to +5 kV/mm. In one sample the space charge profile decayed rapidly with time in short circuit, but in two others the decay rate was negligible.

Original languageEnglish
Title of host publication2006 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
Pages69-72
Number of pages4
DOIs
StatePublished - 1 Dec 2006
Event2006 Conference on Electrical Insulation and Dielectric Phenomena, CEIDP - Kansas City, MO, United States
Duration: 15 Oct 200618 Oct 2006

Publication series

NameAnnual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
ISSN (Print)0084-9162

Conference

Conference2006 Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
Country/TerritoryUnited States
CityKansas City, MO
Period15/10/0618/10/06

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