Abstract
CONVERSAZIONES were held this year on 8 May and 26 June. At the first conversazione there were twenty exhibits and two films were shown. High voltage insulators of the kind used in very large numbers by the Central Electricity Generating Board on the electricity grid transmission network, have been known to fail in areas of heavy atmospheric pollution. If the surface of a polluted insulator becomes damp a leakage current will flow over the insulator and the resultant non-uniform voltage distribution causes unequal drying of the pollution layer, resulting in the formation of dry areas across which arc discharges occur. Dr F. D. A. Boylett of the Central Electricity Research Laboratories showed the mechanism of flashover of high voltage insulators in polluted atmospheres by means of an animated film. He also arranged a demonstration in which a dry area and a wet pollution layer were represented by an air gap in series with a shallow layer of water in a transparent tank. The propagation of the discharge across the water surface was investigated by means of schlieren photography through the layer of water. In the case of the water surface a water wave accompanies the passage of the arc and this was shown in the demonstration.
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