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Application of silicone coatings on porcelain insulators in Poland, a case study

IV th International Scientific Symposium ELEKTROENERGETIKA 01/2007; 1921.

ABSTRACT Silicone coatings have been used to improve insulating properties of outdoor insulators under polluted conditions for over 30 years. In Poland this method was used for the first time in 1995. This paper presents Polish experiences and analyzes the usefulness of such coatings. Changes in pollution emission and their influence on outdoor insulation performance were taken under consideration.

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    ABSTRACT: The evaluation of electrical stress of polluted outdoor insulators was carried out at the field test station located at a copper smelting plant Gogów in 1987 and 2002. Leakage current and flashover voltages were recorded on porcelain long rods of different types. A simple impulse counters having three different trigger levels were used for current measurements. The special fuses with an explosion mixture were applied for detection of flashovers. Additionally, the measurements of ESDD on insulator surface or dust deposition density were carried out. During last ten years the industry dust emission in Middle Europe decreased considerably due to progress in environmental protection. Therefore the similar measurements were repeated with the aim to asses the current state of electrical stress of outdoor insulators.
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    ABSTRACT: The surface conductivity of insulators in the field is often non-uniformly distributed. In this case the integral surface conductivity is not an appropriate parameter of pollution severity. A better evaluation can be achieved on the basis of local conductivity measurements by means of special probes, for example, the rod probe or tissue strip probe. In this work the form factors of different probes are given and the form factor for the rod probe was calculated. The influence of wet-contamination area, the meniscus and the pollution layer thickness on the measured value of surface conductivity are shown. It was found that the surface conductivity on polluted silicone rubber measured by a tissue strip probe is proportional to the equivalent contamination deposit density (ECDD).
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Jun 4, 2014