NDLI: The impulse current degradation of ZnO varistor ceramics

Content Provider	IEEE Xplore Digital Library
Author	Xuetong Zhao Jianying Li Huan Li Shengtao Li
Copyright Year	2011
Description	Author affiliation: State Key Lab. of Electr. Insulation & Power Equip., Xi'an Jiaotong Univ., Xi'an, China (Xuetong Zhao; Jianying Li; Huan Li; Shengtao Li)
Abstract	The effect of impulse current degradation on the property of ZnO varistor ceramics has been performed in this study. The breakdown field $E_{1mA}$ (electric field at 1 $mA/cm^{2})$ increases, keep stable and then decreases with increase of impulse degradation, while nonlinear coefficient α drops significantly over the whole degradation process. SEM results indicate that after the degradation of ZnO varistor ceramics, more voids and inhomogeneity of grain distribution can be observed. In addition, the critical thickness of dimensional effect of ZnO varistor ceramics increases with the impulse current degradation process. The relaxation processes of these samples were also studied by means of dielectric spectra measured in a wide range of temperature and frequency. The activation energy of intrinsic and extrinsic defects which exhibit structure of grain and grain boundary, were decreased obviously when degradation happens. It is suggested that the large impulse current will lead to the breakdown of some grain boundaries and consequently change the microstructure and defect structure of ZnO varistor ceramics.
Starting Page	43
Ending Page	46
File Size	642779
Page Count	4
File Format	PDF
ISBN	9784886860743
e-ISBN	9784886860743
DOI	10.1109/ISEIM.2011.6826272
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-06
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	The Institute of Electrical Engineers, Japan
Subject Keyword	Zinc oxide Varistors Ceramics Degradation Electric breakdown Dielectrics Grain boundaries activation energy ZnO ceramics impulse current degradation dimensional effect
Content Type	Text
Resource Type	Article

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