Event under the auspices of the Ministry of Economy of Slovak Republic

Influence of contamination on the integral surface conductivity of insulators

*Iraida Kolcunová
TU Košice

Pavol Csaji

     Last modified: 2017-03-03

Outdoor insulation of the high voltage equipment is exposed to the contamination and the sporadic atmospheric moistening. It is known that the dry contaminate surface influences on the electrical breakdown strength of insulators of the overhead line very small. The moderate moistening of the contaminating surface layer decreases the insulating level of the overhead line considerably. In the critical case the insulating level of the overhead line may be lower than operating voltage with consequential flashover. The responsible determining the rate of the contamination of the insulators is very important for the electricity supplier in terms of the economic requirements in determining the appropriate external insulation. The article is devoted to the description of the methodology for measuring the leakage current of the polluted insulators including the appropriate method of the surface wetting. Before suggesting a measurement procedure we analyse the results based on the process of making natural contaminant layer on the insulator surface and its gradual humidification in the critical climatic conditions.


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