Abstract
Theoretical studies are made to examine difference in
damage appearance of an porcelain suffering surface discharge
in different media, applying a "transmission-line model" for
surface discharge. Numerical solutions from the model show
that higher applied voltage leads to higher power dissipation.
The, computation is consistent with the experimental result.
that the porcelain suffers severe damage in oil but no damage
in air. An attempt is also ma.de to explain the difference of
puncture occurrence at the shed portion of the porcelain in
oil with different resistivity. Consequently, the model can not
explain the difference of puncture. This suggests requirement
of involving a carrier multiplication process due to impact ionization
in the model to intensify the electric field at the tip of
the streamer.
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