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Prebreakdown currents of vacuum tubes with increased pressure stressed with AC voltage

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2 Author(s)
D. Konig ; High Voltage Lab., Tech. Univ. of Darmstadt, West Germany ; R. Heinemeyer

Prebreakdown currents at AC are mainly determined by emission currents, if the capacitive current component is compensated. Under certain conditions, which are dealt with in this study, HF (high-frequency) impulse currents are superimposed. The shape of the HF impulse current curve as a function of time was recorded with a high time resolution. The steepness of relevant current jumps has been evaluated. On the basis of the results the phenomenon of HF impulse currents is interpreted as a consequence of changing gas attachment to the metallic electrodes

Published in:

IEEE Transactions on Electrical Insulation  (Volume:24 ,  Issue: 6 )