Failure modes and energy absorption capability of ZnO varistors

Failure modes and energy absorption capability of ZnO varistors

Thermal and mechanical behavior of ZnO varistors used in surge arresters is simulated for current pulses of various magnitude and duration. Time dependence of the temperature profile and of the distribution of thermal stresses is computed by solving heat transfer equations for varistor disks with no...

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Bibliographic Details
Published in:IEEE transactions on power delivery Vol. 14; no. 1; pp. 152 - 162
Main Authors: Bartkowiak, M., Comber, M.G., Mahan, G.D.
Format: Journal Article
Language:English
Published: IEEE 01-01-1999
Subjects:
Absorption
Arresters
Computational modeling
Computer simulation
Distributed computing
Electronic devices
Energy absorption
Materials handling
Mathematical analysis
Nonuniform
Surges
Temperature dependence
Temperature distribution
Thermal stresses
Varistors
Zinc oxide
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Summary:Thermal and mechanical behavior of ZnO varistors used in surge arresters is simulated for current pulses of various magnitude and duration. Time dependence of the temperature profile and of the distribution of thermal stresses is computed by solving heat transfer equations for varistor disks with nonuniform electrical properties. The simulations identify failure processes and determine energy absorption capability of varistor elements. The results are in excellent agreement with experiment and provide fundamental explanation of the energy handling dependence upon current surge intensity and duration.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0885-8977
1937-4208
DOI:10.1109/61.736708