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Electrical Characteristics of ZnO Varistors Doped by Al2O3 at Different Sintering Temperatures
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Chaowei JIANG1, Haifeng WANG1, Dongji LIU2, Xiaobin XU1, Liang WEI1, Kun HUANG2, Zhandong WANG3, Huibo HU4
Insulating Materials | 2022, 55(1) : 37 - 41
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Insulating Materials | 2022, 55(1): 37-41
• Material Research •
Electrical Characteristics of ZnO Varistors Doped by Al2O3 at Different Sintering Temperatures
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Chaowei JIANG1, Haifeng WANG1, Dongji LIU2, Xiaobin XU1, Liang WEI1, Kun HUANG2, Zhandong WANG3, Huibo HU4
Affiliations
  • 1State Grid Ningxia Mainteance Company, Yinchuan 750011, China
  • 2Ningdong Branch of State Grid Ningxia Electric Power Co., Ltd., Lingwu 751408, China
  • 3Zhongwei Branch of State Grid Ningxia Electric Power Co., Ltd., Zhongwei 75000, China
  • 4Construction Branch of State Grid Qinghai Electric Power Company, Xining 810001, China
Published: 2022-01-20 doi: 10.16790/j.cnki.1009-9239.im.2022.01.006
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ZnO varistors doped by Al2O3 were prepared under different sintering temperatures, and their microstructure and electrical characteristics were studied by scanning electron microscope, X-ray diffraction, current-voltage test, and capacitance-voltage test. The results show that with the increase of sintering temperature, the leakage current of the ZnO varistor doped by Al2O3 was suppressed significantly, this is due to the continuous increase of donor degree and interface state density increases the barrier height of grain boundary. With the increase of sintering temperature, Al3+ will continuously dissolve into the ZnO grains, the grain resistivity would reduce, and the residual voltage ratio of the ZnO varistor when a large current is passed decreases. When the sintering temperature is 1150℃, the electrical properties of the ZnO varistor are the best, the voltage gradient is 418.7 V/mm, the leakage current is 0.74, the residual voltage ratio is 1.68, and the nonlinear coefficient is 67.5, which is contribute to improve the protective performance of ZnO arrester and limit the overvoltage of the power system, especially the UHV system deeply.

ZnO varistor  /  electrical properties  /  microstructure  /  sintering temperature
Chaowei JIANG, Haifeng WANG, Dongji LIU, Xiaobin XU, Liang WEI, Kun HUANG, Zhandong WANG, Huibo HU. Electrical Characteristics of ZnO Varistors Doped by Al2O3 at Different Sintering Temperatures[J]. Insulating Materials, 2022 , 55 (1) : 37 -41 . DOI: 10.16790/j.cnki.1009-9239.im.2022.01.006
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doi: 10.16790/j.cnki.1009-9239.im.2022.01.006
  • Receive Date：2021-03-11
  • Online Date：2025-12-23
  • Published：2022-01-20
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  • Received：2021-03-11
  • Revised：2021-04-25
Affiliations
    1State Grid Ningxia Mainteance Company, Yinchuan 750011, China
    2Ningdong Branch of State Grid Ningxia Electric Power Co., Ltd., Lingwu 751408, China
    3Zhongwei Branch of State Grid Ningxia Electric Power Co., Ltd., Zhongwei 75000, China
    4Construction Branch of State Grid Qinghai Electric Power Company, Xining 810001, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
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Genus		 种数
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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