Creeping sparks

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

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

Abstract

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.
Original languageEnglish
Title of host publicationProceedings of the 26th NNV Symposium on Plasma Physics and Radiation Technology, 11-12 March 2014, Lunteren, The Netherlands
PublisherNederlandse Natuurkundige Vereniging
Pages30-30
Publication statusPublished - 2014
Event26th NNV Symposium on Plasma Physics and Radiation Technology, March 11-12, 2014,  Lunteren, The Netherlands - De Werelt, Lunteren, Netherlands
Duration: 11 Mar 201412 Mar 2014
http://www.plasmalunteren.nl/download/2014/26th_symposium_lunteren_2014_book_v05mar2014.pdf

Conference

Conference26th NNV Symposium on Plasma Physics and Radiation Technology, March 11-12, 2014,  Lunteren, The Netherlands
CountryNetherlands
CityLunteren
Period11/03/1412/03/14
Internet address

Fingerprint

sparks
insulation
flashover
insulators
gas-solid interfaces
physics
propagation
gas composition
enclosure
high voltages
repetition
rods
conductors
breakdown
electric potential
gases
metals

Cite this

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 (pp. 30-30). Nederlandse Natuurkundige Vereniging.
Trienekens, D.J.M. ; Nijdam, S. ; Christen, T. ; Ebert, U.M. ; Kroesen, G.M.W. / Creeping sparks. Proceedings of the 26th NNV Symposium on Plasma Physics and Radiation Technology, 11-12 March 2014, Lunteren, The Netherlands. Nederlandse Natuurkundige Vereniging, 2014. pp. 30-30
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title = "Creeping sparks",
abstract = "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.",
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Trienekens, DJM, Nijdam, S, Christen, T, Ebert, UM & Kroesen, GMW 2014, Creeping sparks. in Proceedings of the 26th NNV Symposium on Plasma Physics and Radiation Technology, 11-12 March 2014, Lunteren, The Netherlands. Nederlandse Natuurkundige Vereniging, pp. 30-30, 26th NNV Symposium on Plasma Physics and Radiation Technology, March 11-12, 2014,  Lunteren, The Netherlands, Lunteren, Netherlands, 11/03/14.

Creeping sparks. / Trienekens, D.J.M.; Nijdam, S.; Christen, T.; Ebert, U.M.; Kroesen, G.M.W.

Proceedings of the 26th NNV Symposium on Plasma Physics and Radiation Technology, 11-12 March 2014, Lunteren, The Netherlands. Nederlandse Natuurkundige Vereniging, 2014. p. 30-30.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

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T1 - Creeping sparks

AU - Trienekens, D.J.M.

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PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

M3 - Conference contribution

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Trienekens DJM, Nijdam S, Christen T, Ebert UM, Kroesen GMW. Creeping sparks. In Proceedings of the 26th NNV Symposium on Plasma Physics and Radiation Technology, 11-12 March 2014, Lunteren, The Netherlands. Nederlandse Natuurkundige Vereniging. 2014. p. 30-30