A Study of Horizontal Surface Discharge Characteristics for Dew-Point of Dry-Air and Materials of Solid Insulator in Quasi-Uniform Field

Dry Air 중의 준평등전계에서 노점과 고체절연물 재질에 따른 수평연면방전 특성 연구

Kang, Byoung-Chil;Seok, Jeong-Hoo;Min, Gyeong-Jun;Bae, Sungwoo;Lee, Kwang-Sik;Park, Won-Zoo

  • Received : 2014.09.24
  • Accepted : 2014.11.03
  • Published : 2015.01.31


This study investigates the Horizontal surface discharge characteristics of solid insulators by varying their materials, and the dew-point of dry-air. The methodology of this study is that a quasi-uniform field is first applied to a test chamber. Then, the chamber is filled with dry-air as an insulation gas which pressure is varied from 1 to 6atm while applying an AC voltage to the chamber. The used solid insulators are teflon, polyethlene and polyurethane. As the dew-point is lower and the pressure of dry-air is higher, the flashover voltage of all solid insulators increases more. When each characteristic of the solid insulators is compared under the same gas pressure, the flashover voltage of teflon is the highest. Then, the flashover voltage of polyethlene is higher than that of polyurethane. Moreover, it is observed that the flashover voltage increases as the horizontal distance between the electrodes of each solid insulator become larger, respectively. However, as the pressure is increased, flashover voltage of the solid insulators is saturated. Therefore, selection of cost-effective insulation is needed in order to appropriate pressure.


Dry Air;Flashover Voltage;Solid Insulator;Dew Point;Horizontal Surface Discharge


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