Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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Surge Current Characteristics of ZnO-$Pr_6O_{11}$-CoO-$Cr_2O_3-Dy_2O_3$-based Varistors

ZnO-$Pr_6O_{11}$-CoO-$Cr_2O_3-Dy_2O_3$계 바리스터의 써지전류 특성

  • Kim, Myung-Jun (Department of Electrical Engineering, Dong-Eui University) ;
  • Yoo, Dea-Hoon (Department of Electrical Engineering, Dong-Eui University) ;
  • Park, Jong-Ah (Department of Electrical Engineering, Dong-Eui University) ;
  • Nahm, Choon-Woo (Department of Electrical Engineering, Dong-Eui University)
  • 김명준 (동의대학교 전기공학과) ;
  • 유대훈 (동의대학교 전기공학과) ;
  • 박종아 (동의대학교 전기공학과) ;
  • 남춘우 (동의대학교 전기공학과)
  • Published : 2004.07.14
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Abstract

The surge current characteristics of ZnO-$Pr_6O_{11}$-CoO-$Cr_2O_3-Dy_2O_3$-based varistors were investigated with various $Dy_2O_3$ contents. The sintered density decreased in the range of $5.2{\sim}4.6g/cm^3$ with increasing $Dy_2O_3$ content. The incorporation of $Dy_2O_3$ markedly enhanced the nonlinear properties of varistors above 10 times in nonlinear exponent, compared with the varistor without $Dy_2O_3$. The varistor ceramics doped with 0.5 mol% $Dy_2O_3$ exhibited the highest electrical stability. However, the remainder varistors resulted in thermal runaway due to low density of varistor ceramics. The clamping voltage ratio exhibited a minimum value of 2.03 in 1.0 mol% $Dy_2O_3$ at surge current of 100 A(8/20 ${\mu}s$).

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