Conference,

THEORETICAL STUDY ON DAMAGE TO SOLID INSULATING MATERIAL DUE TO SURFACE DISCHARGE IN DIFFERENT MEDIA

, , , , and .
(1991)

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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