Particle-triggered pre-breakdown phenomena in atmospheric air gap under ac voltage

Masanori Hara*, Yulistya Negara, Makoto Setoguchi, Takashi Kurihara, Junya Suehiro, Noriyuki Hayashi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)


Corona discharge mechanism and breakdown voltage characteristics of air gaps in the presence of metallic particles were investigated including the relationship between the corona discharge mechanism and the phase resolved partial discharge patterns. These results are of interest for detection of foreign particles in gas insulated systems (GIS). The results with different shaped particles show that the corona mechanism depends on the particle shape and applied voltage. Moreover the corona discharges on both sides of the particle interfere with each other by inflow of charge carriers into the particle. The breakdown voltage is a minimum when the particle is in the vicinity of the electrode due to active interference of coronas. The phase-charge characteristics as the phase resolved partial discharge patterns vary with the particle shape. This suggests that the corona discharge mechanisms for all types of particles should be considered in the particle-detection method for GIS based on the phase resolved partial discharge patterns

Original languageEnglish
Pages (from-to)1071-1081
Number of pages11
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Issue number5
Publication statusPublished - Oct 2005
Externally publishedYes


  • Floating metallic particle
  • GIS
  • Partial discharge
  • Particle triggered breakdown
  • Phase charge characteristic


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