Abstract
Using an improved pulsed electroacoustic system which is capable of measuring space charge distribution at minimum intervals of 25 /spl mu/s, the charge distribution inside water-treed polyethylene (PE) was examined. From the results, the frequency dependencies of conductivity and permittivity were examined for water trees grown in PE. The conductivity of the water-treed region is found to be >10/sup 10//spl times/ higher than that of non-treed regions, while the permittivity increase is only slight.
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