Evaluation of a New Protective Coating for Porcelain Insulators
This paper describes the evaluation of a new elastomeric coating made from a silicone rubber compound for use on porcelain insulators. Field experience has shown that coated insulators have a lower flashover probability under wet contaminated operation than uncoated insulators.
Properties of silicone rubber housings and coatings
The author reports on the properties of a silicone rubber (SR) composite insulator housing material and a RTV silicone coating for porcelain insulators after a surface deposition of salt pollutants. The materials had undergone long-term aging under natural service conditions. It was found that a wettability recovery effect could appear after a corona treatment on the SR housing material, but this did not occur in the case of the RTV coating. The difference is probably due to the fact that the SR housing, even after exposure to a long-term service, can still embed pollutants in a low molecular polymer structure, whereas the RTV coating loses this ability when subjected to the same aging conditions. This is confirmed by ESCA analysis. The materials were also investigated by means of TSD current technique. Significant changes due to natural aging were found in the thermokinetic parameters of a high-temperature polarization process. It is suggested that these parameters might be used for material comparison. >
What can students learn from studying medicine in literature?
To identify what students can learn from studying medicine and literature as part of a final‐year special study module in general practice.