Polarity effects on breakdown of short gaps in a point-plane topology in air

Hogg, Michael and Timoshkin, Igor and MacGregor, Scott and Wilson, Mark and Given, Martin (2015) Polarity effects on breakdown of short gaps in a point-plane topology in air. IEEE Transactions on Dielectrics and Electrical Insulation, 22 (4). pp. 1815-1822. ISSN 1070-9878

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Abstract

Electrical breakdown in air in a point-plane topology involves complex processes that are still not fully understood. Unlike uniform-field topologies, the highly-divergent fields produced by point-plane topologies create pre-breakdown corona with volumetric space charge. It is known that space charges developed by corona discharge have significant impacts on the breakdown voltage in non-uniform electrode topologies. With large inter-electrode gaps (>cm) the breakdown voltage for a HV point cathode in air at atmospheric pressure is noticeably larger than a HV point anode. However, this paper shows that in shorter point-plane gaps in air (less than ~10 mm), in the air pressure range 0.1-0.35 MPa, an HV point anode has a similar breakdown voltage which eventually is surpassed by the HV point cathode as the inter-electrode gap is increased. The inter-electrode gap at which the HV cathode has a higher hold-off voltage is found to be dependent on the gas pressure and radius of the point electrode.

  • Item type:Article
    ID code:53795
    Dates:
    Date
    Event
    August 2015
    Published
    15 May 2015
    Accepted
    Notes:(c) 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:21 Jul 2015 10:52
    Last modified:08 Apr 2024 21:59
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/53795
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