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A Study on the Effect of the Contact Electrode Slits in the Vacuum Interrupter with Axial Magnetic Field Type

종자계형 진공 인터럽터에서 접점전극 슬릿의 영향에 관한 연구

  • 하덕용 (한양대학교 전기공학과) ;
  • 강형부 (한양대학교 전기전자공학부) ;
  • 최승길 (안산공업대학 전기과) ;
  • 최경호 (동아대학교 기계공학과, (주)디엔디이)
  • Published : 2002.09.01

Abstract

This paper deals with the distribution characteristics of the current density and axial magnetic flux density for each slits made on the contact electrode in the vacuum interrupter with axial magnetic field type using 3-dimension finite element analysis. It has been known that the presence of an axial magnetic field parallel to the current flow in the arc plasma can increase the high current breaking capacity of vacuum interrupter by carrying out the arc plasma from constricted mode to diffusion mode. The axial magnetic field is created of itself by current flow in the segments of coil electrode behind the contact electrode. The analyzed results show that if the slits are made in the contact electrode, they can increase the current density and axial magnetic flux density in the contact electrode surface and at the gap distance, which is due to decrease the effect of eddy currents flowing in the contact electrode. The phase shift due to eddy currents, defined 3s time difference between the maximum value of current and axial magnetic field, is decreased still more by increasing the number of slits made in the contact electrode at the center point of gap distance. These results demonstrate that 3-dimension finite element analysis has a great deal of merits in the development and evaluation of new electrode at the design of vacuum interrupter.

Keywords

References

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