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Ageing, Space Charge and Nanodielectrics: Ten Things We Don't Know About Dielectrics

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conference contribution
posted on 2008-08-13, 15:00 authored by John C. Fothergill
Three areas of considerable progress are identified in the area of polymeric insulation since the mid 1990s (i.e. since the inception of the Eric O. Forster Memorial Lectures): the understanding of ageing, the measurement of space charge, and the development of nanodielectrics. The paper proposes a typology to distinguish and define electrical ageing, degradation and breakdown. With reference to the principal theories of thermo-ageing, it is concluded that there is little direct evidence for ageing even though it is likely to exist, at least above a critical field. The capability to measure space charge has improved considerably and this shows considerable potential as a diagnostic tool. Space charge behaviour is extremely difficult to analyse and general predictions may be impossible in practice. It is, however, necessary to control space charge accumula-tion in HVDC systems. Nanodielectrics continue to offer promise and understanding is improving in this area, particularly in the development of models of interaction zones around nanoparticles.

History

Citation

IEEE International Conference on Solid Dielectrics, 2007, pp. 1-10 - The Eric O. Forster Memorial Lecture (Invited Keynote Opening Address).

Published in

IEEE International Conference on Solid Dielectrics

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

isbn

1424407516

Copyright date

2007

Available date

2008-08-13

Publisher version

http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=4290739

Language

en

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