KEPCO Journal on Electric Power and Energy

  • 제7권2호
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  • Pages.317-321
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  • 2021
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  • 2465-8111(pISSN)
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  • 2466-0124(eISSN)
한국전력공사 (Korea Electric Power Corporation)
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ESS 안전성 개선을 위한 결로 운전 조건 고려 고체절연물 연면 절연파괴특성 분석

Analysis on Solid Insulator Flashover Characteristics on Moisture Contamination for Electrical Insulation Improvement of ESS

  • Kim, Jin-Tae (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Lee, Seung-Yong (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Kim, Ji-young (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Seok, Bok Yeol (KEPCO Research Institute, Korea Electric Power Corporation)
  • 투고 : 2021.01.27
  • 심사 : 2021.09.27
  • 발행 : 2021.12.30
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초록

As the large-scale renewable energy power plant increases, the high-capacity and compact Energy Storage System (ESS) is required. However, this trend could reduce the insulation reliability of ESS. In this study, the surface flashover characteristics for four types of solid insulators are investigated in the uniform electric field with AC and Lightning Impulse (LI) voltage waveforms under various contamination levels. In addtion, insulator surfaces are compared based on the contact angle before and after surface flashover. The experimental results show that AC flashover voltage is dependent on the materials and the contamination level, but LI flashover voltage is only associated with the contamination level. Especially, AC flashover voltage of PC (PolyCarbonate) is higher than that of other insulators, which is associated with the unique and sequential creepage discharge propagation pattern of PC. The localized discharges on the surface of PC form corresponding tracking points. Then, the interconnected trackings result in the complete flashover. This flashover patterns degrade the surface of PC much more than that of epoxy and Bulk Molding Compoud (BMC). Thus, the contact angle of PC is significantly reduced compared to that of other insulators. The increased hydrophilicity in the surface of PC enhances the insulator surface conductivity.

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과제정보

본 연구는 한국전력연구원의 연구비에 의해 지원되었음

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