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Title: Ageing, Space Charge and Nanodielectrics: Ten Things We Don't Know About Dielectrics
Authors: Fothergill, John C.
First Published: Jul-2007
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Citation: IEEE International Conference on Solid Dielectrics, 2007, pp. 1-10 - The Eric O. Forster Memorial Lecture (Invited Keynote Opening Address).
Abstract: 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.
DOI Link: 10.1109/ICSD.2007.4290739
ISBN: 1424407516
Type: Conference paper
Rights: This is the author's final draft of the paper published as IEEE International Conference on Solid Dielectrics, 2007, pp. 1-10 - The Eric O. Forster Memorial Lecture. Copyright © 2007 IEEE. The final version is available from Doi: 10.1109/ICSD.2007.4290739. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Leicester’s products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
Appears in Collections:Conference Papers & Presentations, Dept. of Engineering

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