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
Bok-Hee Lee, Sung-Man Kang: Properties of ZnO varistor blocks under multiple lightning impulse voltages. Current Applied Physics. Vol. 6, Issue 5, 2006, pp. 844 – 851.
Google Scholar
Darveniza M., Saha, T. K.: Surface flashovers on metal oxide varistor blocks. Proceedings of the IEEE 6th International Conference Conduction and Breakdown in Solid Dielectrics, 1998, pp. 406 – 409.
Google Scholar
Flisowski Z.: Technika wysokich napięć. WNT, Warszawa 1992.
Google Scholar
Frącz P.: Wykorzystanie techniki fotograficznej w diagnostyce izolatorów liniowych. Przegląd Elektrotechniczny, R. 89, 5/2013, s. 287 – 289.
Google Scholar
Hang G. J., Wang X.R., Yan Z.: Optical studies of surface discharge under dc voltage in vacuum. IEEE Transaction on Dielectrics and Electrical Insulation, Vol. 9, No.2, 2002, pp. 187 – 193.
Google Scholar
Kogut K., Mazurek B., Kasprzyk K., Zboromirska–Wnukiewicz B.: Wytrzymałość powierzchniowa poliamidowej osłony ogranicznika przepięć w zależności od zawartości włókna szklanego. Przegląd Elektrotechniczny, R. 86, 5/2010, s. 241 – 244.
Google Scholar
Martinez, J. A., Castro-Aranda F.: Lightning Flashover Rate of an Overhead Transmission Line Protected by Surge Arresters. Power Engineering Society General Meeting, IEEE, 2007, pp. 1 – 6.
Google Scholar
Martins, H. Barbosa, F. B., Cruz, W.: Evaluation and diagnosis technique for surge arresters. High Voltage Engineering and Application (ICHVE), 2010, pp. 614 – 617.
Google Scholar
Pohl Z. (red.): Napowietrzna izolacja wysokonapięciowa w elektroenergetyce. Oficyna Wydawnictwa Politechniki Wrocławskiej, Wrocław 2003, (in Polish).
Google Scholar
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
Statistics
Abstract views: 171PDF downloads: 69
License
This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
