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It is generally accepted that dielectric ageing, prebreakdown and breakdown in solid dielectrics are initiated at points of high local field (1). The damage process depends very much on the way the system reacts to the local field enhancement. To make this point clear we discuss a simple example. We consider a simple needle-plate geometry. We furthermore assume that the current density versus local...
Space charges are known to play a very important role in dielectric ageing. The difference between impulse and dc electric strength, the influence of prestressing and impulse rise time on breakdown voltages and the polarity dependence of the breakdown voltage in the needle plate geometry all have been explained by space charge build up (1). In addition, the action of highly energetic charge carriers...
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