Influence of Different SiO2 Addition on the Current Performance of ZnO Varistor
WANG Bowen1, FANG Zhen1, FU Zhiyao2, HU Jianping1, PENG Yongjing1
1 State Key Laboratory of Disaster Prevention & Reduction for Power Grid Transmission and Distribution Equipment, State Grid Hunan Electric Power Company Disaster Prevention and Reduction Center, Changsha 410129, China 2 State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract: Zinc oxide varistors have been widely used in lightning protection of power systems due to their energy tolerance. This work studied the effect of SiO2 addition on the current performance of ZnO varistors. The effects of SiO2 content on the phase transition, microstructure and electrical properties of ZnO varistors were studied. Among these components, SiO2 affects ZnO grain growth. When the SiO2 content increases from 0.2mol% to 2.0mol%, the grain size of ZnO decreases from 8.87 μm to 5.86 μm, resulting in a breakdown voltage E1mA range from 192.77 V/mm to 252.57 V/mm. On the other hand, SiO2 has a significant effect on current energy withstanding capability and pulse aging characteristics. The results show that the content of SiO2 is 1.5mol%, and its current performance is the best. It has an energy capacity of 332.03 J/cm3 and a residual voltage ratio of 1.71 at a current of 5 kA.
王博闻, 方针, 付志瑶, 胡建平, 彭永晶. 不同SiO2含量对氧化锌电阻片通流性能的影响[J]. 材料导报, 2020, 34(Z2): 52-56.
WANG Bowen, FANG Zhen, FU Zhiyao, HU Jianping, PENG Yongjing. Influence of Different SiO2 Addition on the Current Performance of ZnO Varistor. Materials Reports, 2020, 34(Z2): 52-56.
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2020, Vol. 34 
