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The influence of defects on the short-term breakdown characteristics and long-term dc performance of LDPE insulation

Chen, G. and Davies, A. E. (2000) The influence of defects on the short-term breakdown characteristics and long-term dc performance of LDPE insulation IEEE Transactions on Dielectrics & Electrical Insulation, 7, (3), pp. 401-407.

Record type: Article

Abstract

Extruded polyethylene (PE) is used as the bulk insulation for ac high voltage cables; because of its high electric resistivity and breakdown strength. Although the material at present has limited use in dc power cables, it is used extensively in submarine optical communication cable systems. This paper reports on the study of the short term characteristics and long term performance of LDPE insulation under dc electric stress. The results of an investigation is presented in which controlled defects as found in practical systems (voids, metallic and non-metallic particles) were introduced into well characterised polymer material so that their influence on electrical strength and breakdown mechanisms could be determined. Samples were compression-moulded under laboratory conditions and subjected to ramp to failure and electrical ageing tests at various stresses. Weibull statistics are used to analyse the results. Examination of electrically aged samples indicates an oxidation degradation around the defects due to stress enhancement. From the failed samples a value of n in the inverse power model was estimated. The residual life of aged samples was also examined and the results presented.

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More information

Published date: June 2000
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 254009
URI: http://eprints.soton.ac.uk/id/eprint/254009
ISSN: 1070-9878
PURE UUID: 3ddfea29-49a2-49c4-be96-27c9aea1ceec

Catalogue record

Date deposited: 11 Oct 2000
Last modified: 18 Jul 2017 09:55

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Contributors

Author: G. Chen
Author: A. E. Davies

University divisions

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