Fothergill, J. (2007). Ageing, space charge and nanodielectrics: Ten things we don't know about dielectrics. Paper presented at the 2007 International Conference on Solid Dielectrics, ICSD, 08 - 13 July 2007, Winchester, UK.
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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.
|Item Type:||Conference or Workshop Item (Paper)|
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|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)|
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