FAA8F5A0d01 - Test procedures and lifetime data analysis...

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Test procedures and lifetime data analysis for electro-thermal endurance characterisation of EPR-insulated cables G.C. Montanari G. Maztanti L.Simoni Indexing terms: Life tern, Multi-stress, Data analysis, Cables, Ethylene-propylene rubber (EPR) Abstract: The endurance of EPR-insulated cables is investigated by means of laboratory tests on cable models aged by thermal and electrical stresses, single or combined. The electrical, thermal and multi-stress life lines obtained by tests carried out according to a factorial procedure are reported. A significant contribution to plot the lift, lines is provided by the combined analysis method, which allows the electro-thermal life surface tcl be drawn. Indices for electrical, thermal and combined-stress endurance characterisation can thereby be supplied. The test results give hi,;h values of electrical, thermal and multi-stress endurance coefficients for the tested cables. This confirms the good electrical and thermal behaviour of EPR-insulated cables. Finally, a comparison of the results with a life model, able to provide life estimations, is made, obtaining good data fitting. 1 Introduction EPR(ethy1ene-propylene rubber)-insulated cables are widely used in niedium- and high-voltage distribution, showing good electrical, thermal, mechanical and envi- ronmental behalriour [14]. These characteristics, par- ticularly water-1 reeing resistance, have led to the development of EPR-insulated cables for high-voltage applications whcre, however, the challenge of XLPE necessitates high values of design electrical field and current rating. Design optimi sation and performance evaluation of EPR-insulated cables requires knowledge of endurance under thermo-eltxtrical stresses, which has, at present, been investigated but scarcely (contrary to XLPE-insu- lated cables). This lack of knowledge is due to the large amount of short- and long-term life tests necessary for endurance characterisation; which requires the realisa- tion of many tests, often long and expensive. Moreo- ver, the results may not meet the research target in the 0 TEE, 1999 IEE Proceedings onlire no. 19981519 Paper first received 3Clth January and in final revised form 24th June 1997 The authors are with the Department of Electrical Engineering, Univer- sity of Bologna, Viale Risorgimento 2, Bologna, Italy absence of an appropriate methodological approach to data processing. In this paper, the results of accelerated life tests per- formed on EPR-insulated cable models are reported. The full characterisation of endurance under thermo- electrical stress is obtained resorting to a method for data processing, called the combined analysis method (CAM) [5-91, which yields thorough information on multi-stress behaviour by means of a limited amount of test data.
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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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FAA8F5A0d01 - Test procedures and lifetime data analysis...

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