Abstract
It has been found that streamer corona and to a lesser
extent glow corona cause a temporary loss of
hydrophobicity in room and higb temperature vulcanised
silicone rubber insulators. Chemical analysis on the
surface of samples has indicated that silicone compound
is removed from the surface by corona but returns to the
surface by diffusion once the corona activity has ceased.
Should this removal and subsequent replenishment of
silicone compound by corona continue for an extended
period of time, the silicone rubber insulator will
permanently lose its hydrophobic properties.
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