Electrical Properties

  • J. C. Fothergill


The introduction of nanometric inclusions into polymeric insulation has very significant, and usually very beneficial, effects on the electrical conduction, charge accumulation and breakdown properties. This chapter introduces charge transport mechanisms in polymeric insulators and injection processes at electrodes. It speculates on the effect of the introduction of nanoparticles on these processes, showing how percolation pathways may be formed through the interaction zones that surround nanoparticles. This appears to contribute to the reduction of internal charge accumulation. Dielectric spectroscopy is introduced, principally from the engineering point of view. It is considered how nanoparticles and layered nanocomposites affect the dielectric response both at very low frequencies, which gives insights in charge transport mechanisms, and at higher frequencies, which are useful for indicating how particles facilitate and constrain molecular chain movements. Finally, electrical breakdown and endurance are considered. It is shown how both the characteristic breakdown voltage or time-to-breakdown and the distribution of breakdown values may be improved by forming nanocomposite insulation. The chapter concludes by integrating the theories of charge transport, charge accumulation, dielectric relaxation, breakdown and withstand and pointing the way forward.


Space Charge Charge Transport Breakdown Strength Interaction Zone Base Resin 
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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.University of LeicesterLeicesterUK

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