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In this paper, ZnO varistors with high voltage gradient, which were doped with 0.75 mol% Y2O3 and different ratio of Bi2O3, were prepared by classic ceramic fabricating method. The obtained samples were degraded under accelerated AC aging stresses of 0.85 V1mA /135°C/168 h. The electrical properties and Schottky barrier parameters of these samples before and after the aging tests were measured and...
A special simulation model for the surge responses of ZnO varistors is introduced in this paper. This model is based on the Voronoi network and contains the actual conduction mechanism of the grain boundaries, as well as the capacitances of the grain boundaries. The surge responses of the actual varistor samples were simulated and compared with the experimental results. The simulated waveforms agree...
The effects of Bi2O3 doping on the electrical characteristics of Al-doped ZnO varistors were studied. The electrical characteristics and the microstructural parameters of the varistor samples with various content of Bi2O3 additive were investigated. With the amount of the doped Bi2O3 increased, the leakage currents of the Al-doped ZnO varistors are inhibited obviously. In addition, their breakdown...
ZnO varistors have been widely used in power systems as metal oxide arresters (MOA) against overvoltage surges due to their excellent nonlinear current-voltage (I-V) characteristics and surge energy absorption capabilities. The MOA applied in power system with rated voltage usually has remarkable huge size, which results in great difficulty for MOA design and manufacture. Thus, ZnO varistors with...
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