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Extensive high resolution electro-optic Kerr field mapping measurements have been taken with transformer oil near 20°c using parallel plane electrodes and field strengths near 0.2 MV/m. Static field measurements have been extended to the transient period following the application of a step voltage. Significant space charge effects resulting in electrode fields being enhanced by a factor of up to 2...
Since earlier work (1–4) had shown that polarity effects were important, the present study was designed to measure pressure effects under non-uniform field conditions using each polarity. Part of the study was conducted at high magnification to observe the streamer inception voltage under elevated pressures.