Improvement of Electrical Properties of SnO2-CuO-Nb2O5 Varistor
The leakage current of the SnO2-CuO-Nb2O5 varistor is large,which leads to the serious heating of the varistor during normal operation,resulting in the decrease of the nonlinear coefficient and protection level,and cannot be directly used in the lightning arrester.In order to improve the electrical performance of SnO2-CuO-Nb2O5 varistor,the leakage current of SnO2-CuO-Nb2O5 varistor was further studied in this paper.It is found that when 0.05％(mole fraction,the same below)Cr2O3 and 0.05％ Sb2O3 are co-doped,there is no second phase structure in the resistance,the grains are closely fitted,and the microstructure is relatively uniform.The comprehensive electrical performance of the SnO2-CuO-Nb2O5 varistor is also the best,with a high voltage gradient of 423 V/mm;The leakage current was the smallest,0.33 μA/cm2.The nonlinear coefficient is the highest,reaching 33.36.
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