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ZnO varistors are highly non-ohmic resistor and they are widely utilized in protecting electric power transmission line and electronic device against the dangerous overvoltage or voltage surge, and the AC voltage aging characteristic of ZnO varistors is one of the most concerning performance parameters. In this paper, the thermally stimulated current (TSC) performance of ZnO samples has been investigated...
The space charge distributions of different ZnO varistors have been investigated using pulsed electro-acoustic (PEA) method in this paper. There were 8 kinds of ZnO varistors samples sintered under 4 different sintering temperatures with two formulas. According to the experimental results, it was found that there is space charge distribution when the sample is applied with a DC voltage, and the space...
This paper investigated the influence of varied additives/sintering condition on the performance of ZnO based on the space charge distribution measurements. Four kinds of ZnO based varistor samples have been tested. According to the experimental results, the space charge distributions are varied with different samples which were made from different formulas and varied sintering temperatures. The experimental...
A comprehensive review for the scattered phenomenon of energy absorption capabilities of ZnO varistors was presented in this paper. The pronounced and complex scattered phenomena were revealed according to experiments under varied test conditions. Those experiment phenomena were well explained by numerical simulations with microscopic circuit and heat transfer models of ZnO varistor based on Voronoi...
The influence of the geometry and topology of the granular microstructure, as well as the properties and the distribution of the different types of microjunctions on the features of bulk varistor devices is an important and interesting problem. Simulating analysis on the actual microstructure and electrical characteristics of ZnO varistors is used to effectively analyze the influences of different...
Pore is an intrinsic property of ZnO varistor. There are two different shapes of pores in ZnO varistor samples, one is sphere shape, and another is irregular polyhedron. Pores are caused by air particles wrapped in initial varistor compact and grains-surrounded spaces during the sintering. By analyzing the pore phenomena in two different systems of ZnO varistors, we observed the pore ratio decreases,...
By comparing the experimental results of two different systems ZnO varistors, we identify that Sb2O3 is the origin of twinning in commercial ZnO varistors. The additive of Bi2O 3 weakens the effect of Sb2O3 to form twins while the Al2O3 dopant strengthens the twinning. The twins have obvious effect to inhibit ZnO grain growth and uniform its microstructure, because the formed twins result in increasing...
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