03_fothergil_disado - 514 Fothergill et al.: Electrical,...

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514 Fothergill et al.: Electrical, Microstructural, Physical and Chemical Characterization Electrical, Microstructural, Physical and Chemical Characterization of HV XLPE Cable Peelings for an Electrical Aging Diagnostic Data Base J. C. Fothergill G.C. Montanari G. C. Stevens C. Laurent, G. Teyssedre L. A. Dissado U. H. Nilsson Department of Engineering, University of Leicester, Leicester LEI lRH, U.K. DIE-LIMAT, University of Bologna. vide Risorgimenta 2,40136 Bologna. Italy Polymer Research Centre, University of Surrey, Guildford, G42 SXH, UK Universite Paul Sahatier, 118 route de Narhonnc, 31062 Toulouse, Cedex, France Department of Engineering, University of Leicester, Leicester LEI 7RH, UK Borealis AB, 44486 Stenungsund, Sweden and G. Platbrood Laborelec, Rodestraat 125. B-1630, Linkebeek, Belgium ABSTRACT The aim of the European project "ARTEM1S"is to develop a diagnostic system for assessing aging in power cable insulation. Its first task was to make a thorough characterisation of the cable insulation before aging. This is intended to provide a background against which any changes introduced by thermo-electric aging can be identified. The aging markers derived from this initial characterisation will be con- sidered both as diagnostic indicators in their own right, and also to develop an ag- ing model for predictive purposes, if and when possible. This stage of the ARTEMIS' programme is now complete and we will present an analysis of the results, and show how they may he correlated with the concepts proposed in aging theories. Index Terms - Insulating materials, characterization, cables, aging mecha- nism. 1 INTRODUCTION year design life. Much of the related generation and HE requirement for extra high voltage (EH") under- Tground power &Ies (400. 500 kv) is increasing, The mean electric field in the insulation of such cables was transmission equipment (for example nuclear power sta- tions and transformers) have a 40-year design life. If ro- bust methodologies could be found for improving or/and raised recently to about 16 kV/mm and the most common insulation used is polyethylene (XLPE), Long.tem experience of XL~~, however, is limited to moderately stressed cables with mean fields of 5 to kV,mm, Many power cables have been operat. ing for 20 years and are approaching the end of their 30- evaluating the reliability of ac Power cables, it may be possible to continue to use them without compromising the reliability of the system. Such methodologies require considerable improvements in the understanding of degradation mechanisms of cable insulation and the es- tablishment of a dependable life modd. Such Progress would also enable XLPE cables to be more competitive at EHV levels in comparison with oil-paper cables and, even, Monusoipt war mceiued on 25 Noember 2001, in palform I8 March 2003. overheads heS.
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This note was uploaded on 06/08/2011 for the course ELECTRICAL 124 taught by Professor Ghjk during the Spring '11 term at Institute of Technology.

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03_fothergil_disado - 514 Fothergill et al.: Electrical,...

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