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Effect of ambient temperature and air cavities on the breakdown voltage of synthetic materials

Synthetic insulating materials are produced by many production processes such as extruding, moulding, heating, vulcanizing and cooling. Voids or moisture can be contained in these materials due to one or more of the production processes. In addition, they may contain a large number of liquid-filled cavities and small particles. Some of these cavitites may be produced under operating conditions as a result of thermal or chemical deterioration of the insulation. This may occur due to ambient temperature and discharges in voids and cavities. The aim of this work is to study the effect of these two factors, namely ambient temperature and air cavities on the breakdown voltage of polystyrene and polyvinyl chloride as synthetic materials.