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Prebreakdown Conduction in Vacuum Gaps under Switching Impulse Excitations

Srinivasa, KV and Nagabhushana, GR (1985) Prebreakdown Conduction in Vacuum Gaps under Switching Impulse Excitations. In: IEEE Transactions on Electrical Insulation, EI-20 (4). pp. 691-695.


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The present investigation concerns prebreakdown conduction in vacuum gaps under slow impulses. Hemispherical, plane, and needle electrodes have been used in a vacuum emvironment of better than 0.1 mPa. The gap spacings were 0.5, 1, and 1.5 mm. The front times ranged from 200 ps to 5 ins. The results indicate that prebreakdown currents were smaller than the highest sensitivity of $10^{-7} A$ for front times of about 1 ins. For larger front times, breakdown currents were observed, which increased with front time. The voltagecurrent relationship appears to follow Fowler-Nordheim theory but Fowler-Nordheim plots are branched. The high magnitudes may be attributed to ion- ssisted field emission based on which a model has been developed, that agrees substantially with experimental results. Applicability of non-metallic type of emission is discussed

Item Type: Journal Article
Publication: IEEE Transactions on Electrical Insulation
Publisher: IEEE
Additional Information: Copyright 1985 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Department/Centre: Division of Electrical Sciences > High Voltage Engineering (merged with EE)
Date Deposited: 15 Jul 2008
Last Modified: 19 Sep 2010 04:47
URI: http://eprints.iisc.ac.in/id/eprint/14975

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