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2009 | 115 | 6 | 995-997
Article title

Impact of Volume Breakdown on Surface Flashover in High Pressure SF_{6}

Content
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Languages of publication
EN
Abstracts
EN
We investigate the pulsed flashover voltage of dielectric samples at up to 4 bar SF_{6} in the simultaneous presence of a high current (>10 kA, ∼20 microsecond pulse) volume discharge nearby. The chosen distance, ∼7 cm, between surface and volume breakdown is consistent with conditions found in the Sandia-Z-machine type rimfire switch. For a flashover gap distance of 24 mm and a simultaneous excitation within ∼ 5 microseconds, we observe an average reduction in the flashover voltage from 164 kV to 142 kV at 3.7 bar when the volume discharge is turned on. The test setup utilizing a magnetic switching scheme operating at 320 kV and 10 kA is briefly discussed along with the breakdown properties and the spectral characterization of the volume/surface flashover discharge plasma. In general, UV light propagates relatively unattenuated for wavelengths >160 nm in the high pressure SF_{6} from the volume discharge to the dielectric surface, setting up conditions which are conducive to photoelectron emission from the dielectric.
Keywords
EN
Year
Volume
115
Issue
6
Pages
995-997
Physical description
Dates
published
2009-06
References
  • 1. D.R. Humphreys, K.J. Penn, J.S. Cap, R.G. Adams, J.F. Seamen, B.N. Turman, 5th IEEE Pulsed Power Conf., Washington 1985, p. 262
  • 2. R. Vela, J.T. Krile, A.A. Neuber, H.G. Krompholz, IEEE Pulsed Power and Plasma Science Conf. 2007, p. 1831
  • 3. K. Morales, J. Krile, A. Neuber, H. Krompholz, IEEE Trans. Dielectr. Electr. Insul. 13, 803 (2006)
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv115n615kz
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