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Surface discharges on outdoor polymeric insulation

Insulators of polymeric materials for outdoor application have to withstand surface discharges, which may lead to decomposition and erosion. These effects are investigated in a rod-plane test configuration with samples thicker than 1 mm. The qualitative behaviour of the discharges and the patterns of erosion are described. The power loss of the discharges is quantified with an integrating bridge and the influence on the samples is measured by weighing the loss of material caused by erosion. The diagram of loss in weight plotted against accumulated energy dissipated by the discharges is a useful tool to compare samples of different thickness and materials.