The influence of defects on the short-term breakdown characteristics and long-term dc performance of LDPE insulation
The influence of defects on the short-term breakdown characteristics and long-term dc performance of LDPE insulation
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.
401-407
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Davies, A. E.
56d95222-b259-494a-92e9-68b090ec0dcd
June 2000
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Davies, A. E.
56d95222-b259-494a-92e9-68b090ec0dcd
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), .
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.
This record has no associated files available for download.
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: 08 Jan 2022 05:42
Export record
Contributors
Author:
G. Chen
Author:
A. E. Davies
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics