• DocumentCode
    886804
  • Title

    Relationship between polarity of surface leader and contact angle on insulator with backing electrode under AC voltage application

  • Author

    Yamano, Y.

  • Author_Institution
    Dept. of Eng., Chiba Univ., Japan
  • Volume
    140
  • Issue
    2
  • fYear
    1993
  • fDate
    3/1/1993 12:00:00 AM
  • Firstpage
    109
  • Lastpage
    112
  • Abstract
    When AC high voltage is applied in air to a cylindrical insulator with a backing electrode the polarity of generated leaderlike surface discharges depends on the contact angle. The contact angle is the angle between the insulating surface and high voltage electrode on the insulator. In the range of the angle from 60 degrees to 120 degrees the negative surface leaders appear; in the range from 120 degrees to 180 degrees the positive surface leaders appear. No negative surface leaders appear in the range of the angle from 120 degrees to 180 degrees . The onset voltage of the positive leader is higher than that of the negative one. AC flashover voltage along the surface in air also shows dependence on the contact angle, which results from the difference in the onset voltage between the positive and the negative leaders. Impulse flashover voltage, on the other hand, shows no precise contact angle dependence.
  • Keywords
    flashover; insulation; surface discharges; AC flashover voltage; AC voltage; backing electrode; cylindrical insulator; impulse flashover voltage; insulator contact angle; leaderlike surface discharges; surface leader polarity;
  • fLanguage
    English
  • Journal_Title
    Science, Measurement and Technology, IEE Proceedings A
  • Publisher
    iet
  • ISSN
    0960-7641
  • Type

    jour

  • Filename
    210760