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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Study on the Breakdown of the Transformer Insulating Oil in Nonuniform Electric Field

불평등 전계에서 변압기 절연유 절연파괴 연구

  • Ha-Young Cho (Department of Electrical and Electronics, Dongshin University) ;
  • Soon-Hyung Lee (Department of Electrical Eng., Dongshin University) ;
  • Mi-Yong Hwang (Department of Culture Studies, Chosun University) ;
  • Yong-Sung Choi (Department of Electrical and Electronics, Dongshin University)
  • 조하영 (동신대학교 전기전자공학과) ;
  • 이순형 (동신대학교 전기공학과) ;
  • 황미용 (조선대학교 문화학과) ;
  • 최용성 (동신대학교 전기전자공학과)
  • Received : 2023.03.14
  • Accepted : 2023.03.21
  • Published : 2023.05.01
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Abstract

A breakdown voltage and breakdown electric field of the transformer insulating oil of liquid dielectric were studied in uniform electric field and non-uniform electric field and the transformer insulating oil was observed by the process reached breakdown. Insulation performance evaluation of the liquid dielectric was evaluated at the electrode spacing of 2.5 mm under the conditions of domestic and international standards (KS C IEC 60156), so a comparative review was conducted at the electrode spacing of 2.5 mm. When the electrode spacing is 2.5 mm, the average breakdown voltage is 38.5 kV for sphere-sphere electrodes, 26.6 kV for plate-plate electrodes, 22.9 kV for needle-needle electrodes, and 24.3 kV for sphere-needle electrodes. 23.7 kV for the sphere-plate electrode, and 20.7 kV for the needle-plate electrode. From these results, it can be seen that the average value of the breakdown voltage at the electrode spacing of 2.5 mm, in ascending order, is sphere-sphere, plate-plate, sphere-needle, sphere-plate, needle-needle and needle-plate. It was found that the breakdown voltage of the unequal field was lower than that of the equal field.

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References

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