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Origin of thickness dependent dc electrical breakdown in dielectrics
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View: Figures


Image of FIG. 1.
FIG. 1.

Breakdown strength versus sample thickness in polyethylene, clearly indicating the measured breakdown strength decreases with sample thickness.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

Influence of voltage rise rate on the electric breakdown strength, indicating the voltage ramping rate affects the measured breakdown strength.

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Origin of thickness dependent dc electrical breakdown in dielectrics