A Comparison of Energy Loss Characteristics between Radial and Axial Magnetic Field Type Vacuum Switches

대전력 펄스용 횡자계형 및 종자계형 진공스위치의 에너지 손실 특성 비교

  • 이태호 (인하대학 전기공학과) ;
  • 허창수 (인하대학 전기공학과) ;
  • 이홍식 (한국전기연구원 전기물리연구)
  • Published : 2003.03.01


Crowbar system Vacuum switches, widely used In a pulsed power system, could use the magnetic force to prevent the electrode damage. Vacuum switches using the magnetic forces are classified roughly into RMF(Radial Magnetic Field) and AMF(Axial Magnetic Field) type. The RMF type switches restrain a main electrode from aging due to high temperature and high density arc by rotating the arc which is driven by the Lorenz force. The AMF type switches generate axial magnetic field which decreases the electrode damage by diffusing arc. In this paper, we present the energy loss characteristics of both RMF and AMF type switches which are made of CuCr(75:25 wt%) electrodes. The time-dependent dynamic arc resistance of high-current pulsed discharge in a high vacuum chamber(~10$^{-6}$ Torr). which occurs in RMF and AMF type switches, was obtained by solving the circuit equation using the measured values of the arc voltage and current. In addition, we compared energy loss characteristics of both switches. Based on our results, it was found that the arc voltage and the energy loss of an AMF type switch are lower than a RMF type switch.


RMF type switches;AMF type switches;arc voltage;arc loss characteristics


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