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

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


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.

Download full-text


Available from: Krystian Leonard Chrzan, Oct 02, 2015
92 Reads
  • Source
    [Show abstract] [Hide abstract]
    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.
  • [Show abstract] [Hide abstract]
    ABSTRACT: An accelerated-ageing test is conducted on three room-temperature-vulcanised (RTV) coated porcelain insulators, until the initiation of ageing phenomena, in a salt-fog-ageing test chamber. The test conducted was similar to the IEC 1109 1000 h test, but with scaled-down test set-up parameters to address criticisms published in the literature. The results obtained prove the effectiveness of the hydrophobicity of the surface in terms of electrical and material properties. The electrical properties were obtained by online monitoring of the leakage current. The material characteristics were evaluated by conducting energy-dispersion X-ray (EDX) analysis and X-ray-diffraction (XRD) analysis. In addition, the fog dynamics in the test chamber on the direct fog (DF) sample, which is in the axis of nozzle columns, and indirect fog samples IF<sub>1</sub> and IF<sub>2</sub>, which were slightly away from the nozzle column axis, was evaluated. It was concluded that the RTV-coated samples which were kept away from the nozzle-column axis, i.e. IF<sub>1</sub> and IF<sub>2</sub> samples, showed symptoms of initiation of ageing earlier than the sample which was in direct fog mode.
    IET Proceedings - Generation Transmission and Distribution 10/2005; 152(5-152):635 - 644. DOI:10.1049/ip-gtd:20045188 · 0.87 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    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).
    IET Science Measurement ? Technology 10/2007; 1(5-1):295 - 300. DOI:10.1049/iet-smt:20060044 · 0.95 Impact Factor