1978 · 10 citations · 0 references
Natural SciencesElectrical EngineeringPhysicsElectromagneticsElectromagnetismOpticsDielectricsElectrical CharacterizationElectrical ConductivityElectrical MeasurementElectro-optic EffectsElectro-optic MaterialsElectrical BreakdownField MeasurementsInsulating MaterialsKerr EffectLiquid InsulationOptical BreakdownSpace Charge DistributionSpace Charge Measurement
In recent years, optical techniques have been used to identify and classify prebreakdown phenomena in liquid insulating materials. <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1–8</sup> This report describes an attempt to duplicate selected previous results and to extent them by combining time-resolved shadowgraphs with time-resolved electric field measurements using the electro-optic Kerr effect. The addition of electric field measurement permits a determination of the effect of space charge on breakdown and provides information as to whether or not prebreakdown trees are electrical conductors.