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Displacement Current and Surface Flashover

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Description

High-voltage vacuum insulator failure is generally due to surface flashover rather than insulator bulk breakdown. Vacuum surface flashover is widely believed to be initiated by a secondary electron emission avalanche along the vacuum-insulator interface. This process requires a physical mechanism to cause secondary electrons emitted from the insulator surface to return to that surface. Here, we show that when an insulator is subjected to a fast high-voltage pulse, the magnetic field due to displacement current through the insulator can provide this mechanism. This indicates the importance of the voltage pulse shape, especially the rise time, in the flashover initiation process.

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PDF-file: 14 pages; size: 0.4 Mbytes

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harris, J R; Caporaso, G J; Blackfield, D & Chen, Y J July 17, 2007.

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Description

High-voltage vacuum insulator failure is generally due to surface flashover rather than insulator bulk breakdown. Vacuum surface flashover is widely believed to be initiated by a secondary electron emission avalanche along the vacuum-insulator interface. This process requires a physical mechanism to cause secondary electrons emitted from the insulator surface to return to that surface. Here, we show that when an insulator is subjected to a fast high-voltage pulse, the magnetic field due to displacement current through the insulator can provide this mechanism. This indicates the importance of the voltage pulse shape, especially the rise time, in the flashover initiation process.

Physical Description

PDF-file: 14 pages; size: 0.4 Mbytes

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  • Journal Name: Applied Physics Letters, vol. 91, n/a, September 21, 2007, pp. 121504; Journal Volume: 91

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  • Report No.: UCRL-JRNL-233215
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 921160
  • Archival Resource Key: ark:/67531/metadc895789

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • July 17, 2007

Added to The UNT Digital Library

  • Sept. 27, 2016, 1:39 a.m.

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  • Nov. 23, 2016, 4:06 p.m.

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harris, J R; Caporaso, G J; Blackfield, D & Chen, Y J. Displacement Current and Surface Flashover, article, July 17, 2007; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc895789/: accessed January 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.