Partial discharge characteristics of the ultra-high voltage cable insulators according to the measuring temperature

In this paper, it is investigated the effect of the cross linked polyethylene (XLPE) insulators was examined according to the temperature into XLPE which was used as the insulation of the electric power cable for the ultra-high voltage. In order to investigate the effect of changing tree phenomenon according to the temperature on the electrical conduction mechanism, a partial discharge experiment was conducted through the variation of temperature from 25[degC] to 80[degC], and voltage applied to the electrodes from 1[kV] to 40[kV]. The activity of partial discharge according to the temperature was examined using k-means distribution. As a result of experiments, we found that the specimen with 80[degC] has the lowest inception and breakdown voltage, center of clusters move 0, 180 degree at each positive and negative region in the k-means. We obtained that distribution of clusters concentrated on at inception condition, but the distribution spreads out widely at breakdown.