Pulsed unipolar surface flashover at atmospheric conditions

K. Morales, J. Krile, A. Neuber, H. Krompholz, J. Dickens

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

Abstract

Dielectric surface flashover along insulators in vacuum has been comprehensively researched over the years. However, the primary mechanisms involved in dielectric flashover at atmospheric pressures have yet to be as extensively analyzed with variable parameters such as electrode geometry, background gas, humidity, and temporal characteristics of the applied voltage. Understanding the fundamental physical mechanisms involved in surface flashover at atmospheric pressures is vital to characterizing and modeling the arc behavior. Previous dc and unipolar excitation experiments have shown distinct arc behavior in air and nitrogen environments for an electrode geometry that produces electric field lines that curve above the dielectric surface. Specifically, flashover arcs in an air environment were observed to develop along the dielectric surface. Experiments conducted in nitrogen revealed that the arc developed along the electric field lines, above the surface of the dielectric. It was also of importance to alter the temporal characteristics of the applied voltage to simulate lightning situations and investigate the impact on the arc behavior and voltage delay times. A solid state high voltage pulser with an adjustable pulse width of ∼ 500 ns at FWHM and amplitudes in excess of 30 kV was specifically developed to replicate the temporal characteristics of a voltage pulse observed when a building structure is hit by a lightning strike. Based on these results, the physical mechanisms primarily involved in pulsed unipolar surface flashover will be discussed. Additional studies regarding the effects of humidity and surface roughness on the flashover arc behavior will also be presented.

Original languageEnglish
Title of host publication2006 IEEE International Power Modulator Conference, IPMC(27th Power Modulator Symposium and 2006 High Voltage Workshop)
Pages174-180
Number of pages7
DOIs
StatePublished - 2006
Event2006 IEEE International Power Modulator Conference, IPMC(27th Power Modulator Symposium and 2006 High Voltage Workshop) - Washington, DC, United States
Duration: May 14 2006May 18 2006

Publication series

NameConference Record of the International Power Modulator Symposium and High Voltage Workshop
ISSN (Print)1076-8467

Conference

Conference2006 IEEE International Power Modulator Conference, IPMC(27th Power Modulator Symposium and 2006 High Voltage Workshop)
CountryUnited States
CityWashington, DC
Period05/14/0605/18/06

Fingerprint Dive into the research topics of 'Pulsed unipolar surface flashover at atmospheric conditions'. Together they form a unique fingerprint.

  • Cite this

    Morales, K., Krile, J., Neuber, A., Krompholz, H., & Dickens, J. (2006). Pulsed unipolar surface flashover at atmospheric conditions. In 2006 IEEE International Power Modulator Conference, IPMC(27th Power Modulator Symposium and 2006 High Voltage Workshop) (pp. 174-180). [4216162] (Conference Record of the International Power Modulator Symposium and High Voltage Workshop). https://doi.org/10.1109/MODSYM.2006.365210