[KSCI] Korea Science Citation Index Service

http://dx.doi.org/10.4313/TEEM.2014.15.6.348

Degradation Characteristics of Pr/Co/Cr/Er Co-doped Zinc Oxide Varistors by Impulse Current Stress

Nahm, Choon-Woo (Department of Electrical Engineering, Semiconductor Ceramics Laboratory, Dongeui University)

Publication Information

Transactions on Electrical and Electronic Materials / v.15, no.6, 2014 , pp. 348-352 More about this Journal

Abstract

In light of the sure protection function, the most important factors of a varistor are the clamping voltage ratio and degradation characteristics. The degradation characteristics of Pr/Co/Cr/Er co-doped zinc oxide varistors were investigated by impulse currents (0.4~2.1 kA) stress for the specified content of $Er_2O_3$ (0.5 and 2.0 mol%). The varistor doped with 2.0 mol% $Er_2O_3$ exhibited the best clamp characteristics, with the clamp voltage ratio (K) in the range of K = 1.63~1.88 at the impulse currents of 5-50 A. However, the varistor doped with 0.5 mol% exhibited excellent electrical stability, with variation rates for the breakdown field, for the nonlinear coefficient, and for the leakage current density of -6.9%, -12.6%, and -14.3%, respectively, after application of an impulse current of 2.1 kA. In contrast, the varistor doped with 2.0 mol% was destroyed after application of an impulse current of 1.2 kA.

Keywords

Impulse current; Clamp voltage ratio; Degradation characteristics; Varistor;

Citations & Related Records

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