Abstract
The dielectric properties of dodecylbenzene cable oil containing various concentrations of silica, paper, carbon and copper particles were explored. Dielectric spectroscopy and electrical conductivity measurements revealed a critical concentration above which the dielectric properties were adversely affected by the particles. A reduction in electrical breakdown strength was observed as the particle concentration increased. Carbon was the most deleterious material with only 0.005 wt. % required to cause a catastrophic reduction in breakdown strength. The results indicate that carbonaceous particulates, which might arise from electrical discharge activity, are particularly detrimental for high voltage plant.
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