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Published Article / ENY-ARTICLE-2008-214

Behaviour of Zinc Oxide Surge Arresters Under Pollution

Feser, K (University of Stuttgart, Germany) ; Kohler, W (University of Stuttgart, Germany) ; Qiu, D (University of Stuttgart, Germany) ; Chrzan, K L (Wroclaw University of Technology, Poland)


Abstract: This paper presents results of pollution tests with A.C. voltages which were carried out with a multi - unit zinc oxide arrester . The interaction between the polluted porcelain housing and the inner varistor column due to capacitive coupling has been found to be responsible for the temperature rise of varistor elements. The different voltage distribution between inside and outside of the arrester also causes a high radial electric field which can lead to internal discharges if the radial insulation system is not properly designed. These internal discharges may damage varistor elements which are not adequately coated and may cause a total destruction of the arrester . The shape of the internal and external currents due to discharges is analysed. A test method to compare different arrester constructions under severe pollution is proposed. The method can also be applied to demonstrate the absence of discharges for a certain arrester design under extreme conditions of pollution during type tests .

Keyword(s): pollution testing ; metal oxide arrester ; internal discharges ; simulation model
Note: IEEE Transactions on Power Delivery Vol. 6, No. 2, April 1991, pp. 688-695.

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