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Breakdown strength versus sample thickness in polyethylene, clearly indicating the measured breakdown strength decreases with sample thickness.
Positive charge velocity versus the electric field used in the simulation. The first part of velocity up to 100 kV/mm is based on our own measurements12 and the velocity in high field region was obtained from Ref. 11.
Logarithmic representation of the simulated data in Figure 1 showing a linear relationship. The power index n = 0.143 is obtained from the slope of the line.
Influence of voltage rise rate on the electric breakdown strength, indicating the voltage ramping rate affects the measured breakdown strength.
Space charge dynamics across the bulk of the sample showing positive charge front moves slowly into the bulk of the sample during voltage rise stage.
Electric field distribution across the sample during voltage rise stage indicating the maximum electric field moves slowly into the bulk of the sample.
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