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http://dx.doi.org/10.4313/JKEM.2004.17.11.1167

Effect of Sintering Temperature on Electrical Stability against Surge Stress of Zn-Pr-Co-Cr-Er Oxides-based Varistors  

Nahm, Choon-Woo (동의대학교 전기공학과)
Park, Jong-Ah (동의대학교 전기공학과)
Yoo, Dea-Hoon (동의대학교 전기공학과)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.17, no.11, 2004 , pp. 1167-1173 More about this Journal
Abstract
This paper reports the variations of varistor voltage, nonlinear exponent, leakage current, and dissipation factor against surge stress of ZnO-P $r_{6}$ $O_{11}$-CoO-C $r_2$ $O_3$-E $r_2$ $O_3$(ZPCCE)-based varistors manufactured with the variations of sintering temperature. It was found that the variations of electrical parameters against surge stressing current of 100 A/$\textrm{cm}^2$(8x20 ${\mu}\textrm{s}$) is not so large under the surge stress of 700 times. Among varistors, specially the varistor sintered at 134$0^{\circ}C$ exhibited the smallest variations, with %$\Delta$ $V_{lmA}$=+0.23%, %$\Delta$$\alpha$=+0.23%, %$\Delta$ $I_{L}$=0%, %$\Delta$tan$\delta$=-6.94%. The clamping voltage ratio( $V_{c}$/ $V_{lmA}$) of all varistors was less than 2.2.2.2.2.2.2.
Keywords
Varistor voltage; Nonlinear exponent; Surge stress; Clamping voltage ratio;
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