NDLI: Interfacial space charge between ZnO varistor ceramics and coating materials

Content Provider	IEEE Xplore Digital Library
Author	Shengtao Li Jianying Li Chen G. Davis, A.E.
Copyright Year	2002
Description	Author affiliation: State Key Lab. of Electr. Insulation for Power Equip., Xi'an Jiaotong Univ., China (Shengtao Li; Jianying Li)
Abstract	The interfacial space charge distribution between ZnO varistor ceramics and different collar coating materials was investigated using the Pulsed Electroacoustic Method (PEA) and Thermal Stimulated Current (TSC) methods. The experimental results show that a large amount of space charge accumulates at the interface between ZnO varistor ceramics and polyester polyurethane, while there is less space charge presents at the interface between ZnO varistor ceramics and polyester modified silicone. The PEA results show that the introduction of inorganic glass between ZnO varistor ceramics and organic coating materials can greatly reduce the amount of space charge. The results from the surface flashover measurement, which was based on 4/10 /spl mu/s steep impulse current, indicated that more space charge present at the interface between ZnO varistor ceramics and coating materials will lead to lower withstanding flashover capability of ZnO blocks since the electric field can be deviated due to the existence of interfacial space charge.
Starting Page	478
Ending Page	481
File Size	256311
Page Count	4
File Format	PDF
ISBN	0780375025
DOI	10.1109/CEIDP.2002.1048838
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-10-20
Publisher Place	Mexico
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Space charge Zinc oxide Varistors Ceramics Coatings Flashover Pulsed electroacoustic methods Glass Inorganic materials Organic materials
Content Type	Text
Resource Type	Article

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Relationship between space charge and nonlinear characteristics of ZnO varistor

Surface flashover characteristics in vacuum of ZnO Varistor+Al Ceramic+ZnO Varistor Insulators

Evaluation and failure analysis of high-resistance collar coating of varistor

A study on the space charge distribution of ZnO varistor

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DC degradation of ZnO varistor and its restorability by heat-treatment

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The impulse current degradation of ZnO varistor ceramics

Interfacial space charge between ZnO varistor ceramics and coating materials

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