Earticle

초록

영어

The study on the dielectric characteristics of gaseous insulation medium is important for designing current leads of superconducting machines using a sub-cooled liquid nitrogen (LN2) cooling method. In a sub-cooled LN2 cooling system, the temperature of gaseous insulation medium surrounding current leads varies from the temperature of coolant to 300 K according to the displacement between the electrode system and the surface of sub-cooled LN2. In this paper, AC withstand voltage experiments on gaseous nitrogen according to temperature are conducted. Also, AC withstand voltage experiments on gaseous nitrogen according to pressure, size of electrode, and gap length between two electrodes are performed. It is found that there is a functional relation between the electrical breakdown voltage and the field utilization factor (ξ). As a result, the empirical formula for estimating an electrical breakdown voltage is deduced by adopting the concept of field utilization factors. It is expected that the experimental results presented in this paper are helpful to design current leads for a high voltage superconducting apparatus such as a superconducting fault current limiter (SFCL) using a sub-cooled LN2 cooling system.

목차

Abstract
 1. INTRODUCTION
 2. DIELECTRIC CHARACTERISTICS OF GN2 ACCORDING TO TEMPERATURE
  2.1. Temperature distribution of a gaseous part
  2.2. Dielectric experiments according to temperature
 3. EXPERIMENTAL SET-UP AND CALCULATION
  3.1. Sphere-plane electrode system
  3.2. Calculation of field utilization factors
 4. EXPERIMENTAL RESULTS AND DISCUSSION
  4.1. Experimental results of AC withstand voltage experiments
  4.2. Discussion
 5. CONCLUSION
 ACKNOWLEDGMENT
 REFERENCES

저자

• Jeong II Heo [ Dept. of Electrical Engineering, Korea National University of Transportation, Chungbuk, Korea ]
• Jonggi Hong [ Dept. of Electrical Engineering, Korea National University of Transportation, Chungbuk, Korea ]
• Seokho Nam [ Dept. of Electrical Engineering, Korea National University of Transportation, Chungbuk, Korea ]
• Hyoungku Kang [ Dept. of Electrical Engineering, Korea National University of Transportation, Chungbuk, Korea ] Corresponding Author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국초전도·저온논문지 (구 한국초전도저온공학회논문지) [Progress in Superconductivity and Cryogenics]

• 간기

  계간

• pISSN

  1229-3008

• eISSN

  2287-6251

• 수록기간

  1999~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 427 DDC 537