Sessile water droplets on insulating surfaces subject to high AC stress effect of contact angle

B.H. Crichton, R.A. Fouracre, H.A. Gouda, M.T. Stickland

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Surface pollution of outdoor high-voltage insulators is an important cause of flashover. We have undertaken an experimental study of electrical breakdown at the edges of a sessile water droplet on a planar, polymeric, insulating surface when subject to AC stress, parallel to the insulator surface, up to 2MV/m. The static contact angle between droplet and surface was varied by controlling the physical properties of the droplet and by inclining the insulator plane from the horizontal. The partial discharge activity from the water droplet was investigated using a combination of high-speed video camera, operated at up to 3,000 frames per second, and an electrical partial discharge detection system. We have used this to examine the location of partial discharge at the edges of the water droplet.
Original languageEnglish
Title of host publication37th International Universities Power Engineering Conference
Subtitle of host publication(UPEC 2002) 9th, 10th & 11th September 2002
Place of PublicationStafford
Number of pages5
Publication statusPublished - 2002
Event37th International Universities Power Engineering Conference - University of Staffordshire, Stafford, United Kingdom
Duration: 9 Sep 200211 Sep 2002


Conference37th International Universities Power Engineering Conference
Abbreviated titleUPEC 2002
Country/TerritoryUnited Kingdom


  • surface pollution
  • fluid dynamics
  • water
  • pumps
  • droplets

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