Creeping sparks

D.J.M. Trienekens, S. Nijdam, T. Christen, U.M. Ebert, G.M.W. Kroesen

Onderzoeksoutput: Hoofdstuk in Boek/Rapport/CongresprocedureConferentiebijdrageAcademic

Samenvatting

In gas insulated high voltage devices usually solid insulation materials are also present, e.g., for mechanical support of conductors or as enclosure. Even if the gaseous and solid insulation media themselves have sufficient dielectric strength, electric breakdown may still occur because the gas-solid interfaces are usually weaker. For instance, triple points of metal, gaseous, and solid insulation can be critical with respect to inception, and insulator surfaces facilitate propagation of discharges, which may lead to surface flashover. Sparks creeping along insulator surfaces are well-known, but the underlying fundamental physics is poorly understood. The improvement of (nowadays empirical) design rules of insulation devices for the prevention of surface flashover requires thus a deeper understanding of the associated physics. In this research work, the streamer-like initial phase of sparking will be investigated. A setup was built that enables us to study discharges along the surface of an insulating rod. We use stroboscopic imaging at gating frequencies up to 100 MHz to visualize inception and propagation of the discharge. Results indicate that streamers propagate with an increased velocity along the dielectric surface upon contact. Surface discharges, however, do not appear under all circumstances: for some parameters the discharge avoids the surface. The corresponding parameter window for sticking behavior depends on gas composition, pressure, voltage, and repetition frequency.
Originele taal-2Engels
TitelProceedings of the 26th NNV Symposium on Plasma Physics and Radiation Technology, 11-12 March 2014, Lunteren, The Netherlands
UitgeverijNederlandse Natuurkundige Vereniging
Pagina's30-30
StatusGepubliceerd - 2014
Evenement26th NNV Spring Symposium for Plasma Physics & Radiation Technology, Lunteren, The Netherlands - De Werelt, Lunteren, Nederland
Duur: 11 mrt 201412 mrt 2014
http://www.plasmalunteren.nl/download/2014/26th_symposium_lunteren_2014_book_v05mar2014.pdf

Congres

Congres26th NNV Spring Symposium for Plasma Physics & Radiation Technology, Lunteren, The Netherlands
LandNederland
StadLunteren
Periode11/03/1412/03/14
Ander26ste Annual Meeting on Plasma Physics and Radiation Technology CPS/NNV, Lunteren, 11-12 maart 2014
Internet adres

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  • Citeer dit

    Trienekens, D. J. M., Nijdam, S., Christen, T., Ebert, U. M., & Kroesen, G. M. W. (2014). Creeping sparks. In Proceedings of the 26th NNV Symposium on Plasma Physics and Radiation Technology, 11-12 March 2014, Lunteren, The Netherlands (blz. 30-30). Nederlandse Natuurkundige Vereniging.