Study on the Algae Contamination and Its Effects on the Properties of RTV-Coated Insulators

Abstract

The surface of organic insulating materials such as room temperature vulcanized silicone rubber (RTV) coatings often has serious contamination deposition. In humid areas such as the Southwest region of China, algae contamination layers are present on the surface of the insulators. In this study, the geographical and creeping distribution of algae contamination on the surfaces of RTV insulators were studied by investigating and sampling various substations in the Southwest region. The main components of soluble salts in the contamination were studied by atomic absorption spectroscopy and ion chromatography. The algal genome was extracted by the cetyltrimethylammonium bromide method, and the species of algae and other microorganisms in the contamination layer were determined. The effects of algae or their secretions on the surface resistance and hydrophobicity were studied by quantitatively inoculating algae and smearing extracellular secretions on the RTV surface. The damage of the algae contamination layer to the microstructure of the silicone rubber was investigated by microscopic observation and thermogravimetric analysis. Results showed that the growth of algae was positively correlated with the surface contamination of RTV. The extracellular secretion of algae destroys the surface microstructure of RTV and causes the removal of alumina hydroxide, leading to the reduction of siloxane. Therefore, the resistance and hydrophobicity of the RTV surface were reduced. It is of great significance to study the characteristics and effects of the algae contamination layer for RTV maintenance.

The Effect of Humidity and Temperature on Flashover in High Voltage Transmission Line Ceramic Insulators

“…Temperature and humidity are two environmental factors that influence the ability of insulators to withstand flashover voltage [7], [15], [17]. They may be less effective at preventing flashover in conditions of high humidity and extreme heat [4], [18] [15], [19].…”

“…Contamination and humidity affect the electrical properties of flashover in polluted insulators. Increasing humidity reduces the flashover voltage gradient for all contamination profiles [16], [17]. The flashover voltage will decrease as the ambient temperature rises because an increase in temperature may reduce the resistivity values of a polluted insulator's surface and increase the leakage current.…”