Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Electrical Characteristic of a Suspended Porcelain Insulator with a 154 kV Transmission Line

154 kV 송전선로 자기재 현수 애자의 전기적 특성 규명에 관한 연구

  • Jeon, Seongho (College of Information and Communication Engineering, Sungkyunkwan University) ;
  • Choi, In-Hyuk (Korea Elctric Power Corporation (KEPCO) Research Institute) ;
  • Kim, Taeyong (College of Information and Communication Engineering, Sungkyunkwan University) ;
  • Lee, Youn-Jung (College of Information and Communication Engineering, Sungkyunkwan University) ;
  • Koo, Ja-Bin (Korea Elctric Power Corporation (KEPCO) Research Institute) ;
  • Son, Ju-Am (Korea Elctric Power Corporation (KEPCO) Research Institute) ;
  • Yi, Junsin (College of Information and Communication Engineering, Sungkyunkwan University)
  • 전성호 (성균관대학교 정보통신대학) ;
  • 최인혁 (한국전력공사 전력연구원) ;
  • 김태용 (성균관대학교 정보통신대학) ;
  • 이윤정 (성균관대학교 정보통신대학) ;
  • 구자빈 (한국전력공사 전력연구원) ;
  • 손주암 (한국전력공사 전력연구원) ;
  • 이준신 (성균관대학교 정보통신대학)
  • Received : 2019.08.27
  • Accepted : 2019.10.01
  • Published : 2020.01.01
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Abstract

Porcelain insulators are typically exposed to surface discharge and lightning impulse in service. This study investigates the insulation characteristics of the external and internal discharges of a porcelain insulator with respect to its flashover for a 154 kV transmission line. The experiments are also conducted using a wet flashover test and an impulse test based on the external discharge and the internal penetration, to classify the flashover voltage-time curve of the porcelain insulator. When an impulse with a strength of 2,500 kV/㎲ was applied three times to 6.5 mm ceramic samples, electrical penetration of approximately 70% occurred. The impulse experiment confirmed that the electrical penetration inside the porcelain insulator coincided with the area where the electric field was concentrated. The wet flashover voltage test revealed that the flashover threshold voltage increases by approximately 7% after cleaning of the surface.

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