THE IMPULSE CHARACTERISTICS AND ELECTRIC STRENGTH OF VARISTORS PILES DEPEND ON GEOMETRY OF THE ELECTRODES
Krzysztof Kogut
k.kogut@iel.wroc.plElectrotechnical Institute, Division of Electrotechnology and Materials Science, Wrocław (Poland)
Krzysztof Kasprzyk
Electrotechnical Institute, Division of Electrotechnology and Materials Science, Wrocław (Poland)
Beata Zboromirska-Wnukiewicz
Electrotechnical Institute, Division of Electrotechnology and Materials Science, Wrocław (Poland)
Abstract
The paper describes the results of the impulse characteristics and electric strength measurements of the pile of varistors with modified side surface. Basing on the impulse voltage tests on the surge arresters it was found that one of the reasons of the failures of these devices may be the surface discharge at the varistor - insulating housing phase boundary, through the gas between them. Flashover voltage of power protecting systems can be increase by applying of semi – conducting covers which will carry away the generated surface charge and uniform the distribution of electric field on material surface. Comparing two types of electrodes configuration on varistors, it was found that systems without gap between electrode and side surface of varistor exhibited higher values of withstanding voltage whether their side surfaces were covered or not covered with insulating or semiconducting layer.
Keywords:
varistors, surface discharge, electric strength, flashover voltageReferences
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Authors
Krzysztof Kogutk.kogut@iel.wroc.pl
Electrotechnical Institute, Division of Electrotechnology and Materials Science, Wrocław Poland
Authors
Krzysztof KasprzykElectrotechnical Institute, Division of Electrotechnology and Materials Science, Wrocław Poland
Authors
Beata Zboromirska-WnukiewiczElectrotechnical Institute, Division of Electrotechnology and Materials Science, Wrocław Poland
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