Leonard A. Dissado

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Research on the vacuum surface flashover mechanisms of insulating material under nanosecond pulses is important for the design and manufacture of high power pulse generators. Here the vacuum surface flashover characteristic of epoxy composites filled with different micro-fillers, Al2O3•3H2O, Al2O3, BaTiO3 , and TiO2 is investigated using a unipolar pulse(More)
A quantitative physical model has been expressed in terms of features generic to electrical ageing. This has been used to simulate the evolution of damage structures during the electrical ageing of insulating polymers. During the main part of the ageing process isolated regions of damage were produced at a few extremely susceptible sites. However failure(More)
Small but repetitive charge packets injected from both electrodes, that cross insulation very rapidly and accumulate at the counter electrodes, are observed in polyethylene-based insulating materials. The results presented in this paper show that the charge packet amplitude remains almost independent of field and temperature, while mobility and repetition(More)
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