Abstract

This paper calculates the lowest limit of voltage-time (V-t) characteristics of impulse breakdown for a concentric cylinder gap in SF6 gas. The calculation program is developed by introducing the streamer theory and streamer development phenomena in the gas gap. V-t characteristics of the concentric cylinder gap are calculated as parameters of the applied voltage waveform, gas pressure, and size of protrusions on the inner cylinder surface. The calculated V-t characteristics agree closely with the lowest limit of the measured ones for gas pressures from 1.5 to 2.5 bar for positive polarity, but only roughly coincide for negative polarity

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