Characteristics of Surface flashover in LN2

액체질소 중에서의 연면방전 특성

  • 정종만 (경상대학교 전기공학과 및 공학연구원) ;
  • 백승명 (경상대학교 전기공학과 및 공학연구원) ;
  • 김상현 (경상대학교 전기공학과 및 공학연구원)
  • Published : 2003.01.01


For the development of superconducting power apparatus, it is necessary to establish the dielectric technology in coolant like L$N_2$. Therefore in this paper we conducted experiment of surface flashover that could occur in the windings of HTS transformer which will be developed in the pancake coil type. First, we distinguished two types of surface flashover by electrode alignment, such as parallel and vertical, and then compared with each characteristics of surface flashover. The flashover voltage was more affected by thickness of spacer than by surface length when the thickness of spacer is over 1 mm. And the surface flashover with metallic particle attached on the spacer was tested, it was affected by the particle position. The more close to the electrodes, the worse the characteristics. Also the experiment was conducted when the electrode was immersed in liquid nitrogen(L$N_2$) partially. The surface flashover characteristics of spacer was, when immersed partially in 50%, rapidly decreased.


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