Imaging of negative polarity dc breakdown streamer expansion in transformer oil due to variations in background pressure

Michael D. Cevallos, Michael Butcher, James Dickens, Andreas Neuber, Hermann Krompholz

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

The breakdown physics of transformer oil is investigated using high speed electrical and optical diagnostics. Experiments are done in self-breakdown mode utilizing a needle/plane geometry. Shadowgraphy combined with high-speed electrical diagnostics are aimed at measuring streamer expansion as a function of external pressure. Assuming a breakdown mechanism for negative needle based on bubble formation with subsequent carrier amplification in the gas phase implies a pressure dependence, which is observed in the experiments, i.e. the expansion velocity decreases with increasing pressure.

Original languageEnglish
Pages (from-to)494-495
Number of pages2
JournalIEEE Transactions on Plasma Science
Volume33
Issue number2 I
DOIs
StatePublished - Apr 2005

Keywords

  • Breakdown
  • Liquid dielectrics
  • Plasma
  • Streamers

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