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Parameter Study of Impact Characteristics for a Vacuum Interrupter Considering Dynamic Material Properties

동적 물성치를 고려한 진공 인터럽터 충격특성의 영향인자 분석

  • Lim, Ji-Ho (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Song, Jeong-Han (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Huh, Hoon (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Park, Woo-Jin (The Power Research Center of LG Cable) ;
  • Oh, Il-Seong (The Power Research Center of LG Cable) ;
  • Ahn, Gil-Young (The Power Research Center of LG Cable) ;
  • Choe, Jong-Woong (The Power Research Center of LG Cable)
  • 임지호 (한국과학기술원 기계공학과) ;
  • 송정한 (한국과학기술원 기계공학과) ;
  • 허훈 (한국과학기술원 기계공학과) ;
  • 박우진 (LG산전 전력연구소) ;
  • 오일성 (LG산전 전력연구소) ;
  • 안길영 (LG산전 전력연구소) ;
  • 최종웅 (LG산전 전력연구소)
  • Published : 2002.05.01

Abstract

Vacuum interrupters in order to be used in various switch-gear components such as circuit breakers, distribution switches, contactors, etc. spread the arc uniformly over the surface of the contacts. The electrodes of vacuum interrupters are made of sinter-forged Cu-Cr materials for good electrical and mechanical characteristics. Since the closing velocity is 1-2m/s and impact deformation of the electrode depends on the strain rate at that velocity, the dynamic behavior of the sinter-forged Cu-Cr is a key to investigate the impact characteristics of the electrodes. The dynamic response of the material at the high strain rate is obtained from the split Hopkinson pressure bar test using disc-type specimens. Experimental results from both quasi-static and dynamic compressive tests are Interpolated to construct the Johnson-Cook model as the constitutive relation that should be applied to simulation of the dynamic behavior of the electrodes. The impact characteristics of a vacuum interrupter are investigated with computer simulations by changing the value of five parameters such as the initial velocity of a movable electrode, the added mass of a movable electrode, the wipe spring constant, initial offset of a wipe spring and the virtual fixed spring constant.

Keywords

Split Hopkinson Pressure Bar;Vacuum Interrupter;Strain Rate Hardening;Chattering

References

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