On the conducting and non-conducting electrical trees in XLPE cable insulation specimens


The conducting and non-conducting properties of electrical trees in cross-linked polyethylene (XLPE) cable insulation are studied by suggests that of partial discharge (PD) measurement, optical microscope, confocal Raman microprobe spectroscopy and scanning electron microscopy (SEM). Specimens equipped with an embedded electrode system and constituted of a needle separated by approximately a pair of mm from the counter electrode were utilised. Various varieties of electrical trees were created at a range of voltage levels from nine to 15 kV. It absolutely was found that the electrical trees grown at low voltage levels exhibited very completely different electrical properties from those grown at higher voltage levels. Branch-pine trees were shaped at the low voltage conditions, displaying buildup of conducting main channels composed of disordered graphitic carbon deposited on the tree sidewalls. The common domain of the graphitic residues was estimated at the range of 8-8.four nm in size, that resulted in an exceedingly sufficient channel conductivity to suppress the PD activity among the most tree channels and caused growth of the pine structure. The branch trees, grown at higher voltage levels, showed typical characteristics of non-conducting trees, in that continuous discharges eroded the tree sidewalls and the observed intensity of fluorescence decreased evidently with the space from the needle electrode to the tree tip. The bush trees at high voltage levels conjointly showed the non-conducting characteristics. However, some carbonized residues were fashioned domestically in them close to the needle electrode, which can be connected to the long and intensive discharge activity during the tree growth.

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