A Comparative Study of AC Porcelain Insulators Characteristics with Cement Dust Particles and Kaolin Surface Coatings
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Abstract
In recent years, the area with high quantity of dust in Thailand has attracted increasing attention in the field of electrical insulator. High dust quantity in air is an extreme weather condition with high concentrations of suspended particulate matter. This can lead to high conductivity on insulator. This paper was to compare the insulator characteristics with cement dust and kaolin coatings. The cement dust was obtained from cement manufacturing industrial area at Saraburi province in Thailand. Simulated contamination tests were then conducted using porcelain insulators class 52-1. The test found that the flashover voltage of the insulators trapped with dust particles was higher than that of insulators trapped with kaolin while the leakage current of the insulator trapped with dust particles was lower. The hydrophobic of the insulators was stated using water droplet on the insulators surface. This indicated that the insulators trapped with kaolin had better hydrophobic characteristic that those trapped with dust particles. This may be due to better solubility of kaolin and smaller sizes in particles.
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