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Research of the influence of humidity and contamination on glass and silicon rubber insulating materials by leakage current measurement
*Ľuboš Šárpataky
Department of Electric Power Engineering, Technical University of Košice
*Bystrík Dolník
Department of Electric Power Engineering, Technical University of Košice
Last modified:
2022-06-20
Abstract
The reliability of transmission and distribution of electricity is highly dependent on the reliability of insulators. The insulator is the main insulating element of the transmission and distribution lines. It must operate without failure throughout its service life. However, there are situations where its reliability is compromised. Moisture and pollution are the main factors that reduce the electrical strength of insulators. This study is devoted to the formation and research of a layer of contamination formed on the surface of external insulation made of glass and silicone rubber. After mixing solutions representing different contamination levels, these solutions were applied to the insulation surfaces. Leakage current was measured on contaminated surfaces at various humidity from 40 % to 90 %. The applied layer was washed from the insulation materials to calculate the equivalent salt deposit density (ESDD) and non-soluble deposit density (NSDD) according to IEC/TS 60815-1: 2008 and determine the contamination level for the used insulation material. The measurement results showed that the effect of pollution and humidity on the magnitude of the leakage current is significant. The increase in leakage current is the most pronounced between 60 % and 70 % of relative humidity. The amount of pollution that settles on the insulator surface depends on the hydrophobicity of the material.
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