Abstract
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.
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