02_multistres_montanari - 730 IEEE Transactions on...

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730 IEEE Transactions on Dielectrics and Electrical Insulation , Vol. 9 No. 5,October2002 Progress in Electrothermal Life Modeling of Eleckical Insulation during the Last Decades G. C. Montanari, G. Mazzanti, L. Simoni Department of Elechical Engineefing, University of Bologna, Italy ABSTRACT This paper has the purpose of highlighting the achievements during the last decades in life modeling under electrothermal stress. Phenomenological and physical models are examined, considering also a statistical approach, with applications to experimental results. . 1 INTRODUCTION The last two to three decades have brought considerable contribu- tions to the understanding of aging mate- rials subjected to different types of stress during service operation. In the Same period, life modeling has reached significant goals, which go fromphenomenological frameworks able to lit failure time data lor various Stresses (singly or ShuItaneouslY applied) and derive Param- eters for 111, to physical different mechanisms related to insulation degradation [Z, 31: A conse- quence of the intense activity carried out with the purpose of under- ments reached in the last two-three decades on the aspects mentioned above, i.e. life modeling and aging process investigation, referring, in particular, to the huge of work published in the IEEE T~~~~ ACTIONS ON ELECTRICAL INSULATION (TEI), and its successor, the ~EEE ON D~~~~~~~~~~ AND^ E~~~~~~~~~ lNSULA. TION (TDEI), under the guidance ofthe Editor A. van Roggen, as well as in the conferences of the DIELECTRICS AND ELECTRICAL SOCIETY (DEIS). Focus is placed, for the sake of brevity, on electrical and thermal stress, these being the stresses which mostly age and cause failure of electrical insulation systems, for standing stress endurance of insulation, has been the introduction of normative references in IEC and IEEE publications (e.& [&6] regarding thermal, electrical, mechanical, environmental and multiple stresses), which support the maturity and the progress obtained on this topic. On the other side, however, theneed of moreand moreknowledge requires further research work (an example of the dissatisfaction of researchers is well represented by the documents coming from the activities of the Multifactor Stress Committee of the IEEE DEIS, e.g. [7]). Such a huge amount of work was originated mainly by new needs appearing in the last decades, which can be associated with the in- creased usage of Polymeric insulation and the recent requirement of increasing the desip stress, in order to make more compact devices and to reduce costs without affecting insulation system reliability. The progressive growth in the use of polymeric materials (which are, Po- tentially, cheaper, environmentally compatible, of wider and easier use and application than the non-polymeric ones) has brought Out a Prob- lem that, perhaps, had not been considered adequately at the he of the origin of investigation on electrical breakdown, i.e.
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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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02_multistres_montanari - 730 IEEE Transactions on...

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