The Transactions of the Korean Institute of Electrical Engineers C (대한전기학회논문지:전기물성ㆍ응용부문C)

The Korean Institute of Electrical Engineers (대한전기학회)
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Breakdown Characteristics of Liquid Nitrogen Induced by Quench

Quench에 의해 유도되는 액체 $N_2$의 절연파괴 특성

  • Kim, Yeong-Seok (Dept.of Electrical Engineering, Engineering College, Gyeongsang National University) ;
  • Jeong, Jong-Man (Dept.of Electrical Engineering, Engineering College, Gyeongsang National University) ;
  • Gwak, Min-Hwan (Dept.of Electrical Engineering, Engineering College, Gyeongsang National University) ;
  • Jeong, Sun-Yong (Dept.of Electrical Engineering, Engineering College, Gyeongsang National University) ;
  • Kim, Sang-Hyeon (Dept.of Electrical Engineering, Engineering College, Gyeongsang National University)
  • 김영석 (경상대 공대 전기공학과) ;
  • 정종만 (경상대 공대 전기공학과) ;
  • 곽민환 (경상대 공대 전기공학과) ;
  • 정순용 (경상대 공대 전기공학과) ;
  • 김상현 (경상대 공대 전기공학과)
  • Published : 1999.01.01
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Abstract

Electrical breakdown characteristics of liquid nitrogen($LN_2$) used as both coolant and insulator for high $T_c$ superconductor system are very important. This paper presents dynamic breakdown characteristics fo $LN_2$ by quench phenomena of thermal bubble under high electric field. Experimental results revealed dynamic breakdown voltage fell down drastically compared with the static breakdown voltage without the quench. Because of increasing heat power, bubble size becomes big and breakdown voltage decreases. The breakdown voltage mechanism of $LN_2$ depends on thermal bubble effect. In the Electrode arrangement, electrical breakdown voltage of horizontal arrangement appears lower than that of vertical arrangement. Also, we observed the behavior of thermal bubbles in $LN_2$ which were generated after quench using camera.

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References

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