الفهرس 
summary of the thesisOnly 14 pages are availabe for public view
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Abstract
A comparison between alston-zoledziowski condition for d.carc burning and hampton condition for d.carc propagation on the surface of a contaminated insulator is presented the ranges of apf’licability of obenaus bohemia criteria for arc propagation with and without persisting partial arcs are determined analytically generalizAtion of obenaus-boehme criteria is elaboratedsome factors affecting the flashover voltage due to digest deposits are investigated experimentally proceixjres for the selection of the number of tests and the number of tested insulators per string has been aLso established.