Advanced Application Report High Voltage XLPE Insulated Power Cable with Semi-Conducting Organic Liquid

In our previous paper*1 we reported our fundamental study and, to some extent, application to cables of the semiconductive organic liquid which, when mixed in cross- linked polyethylene insulation for cable, deposits on the surfaces of voids in the insulation or between the insulation and the semiconductive layer with the lapse of time and brings about a remarkable reduction in surface restivity there, thus weakening the electric field within voids and eliminating partial discharges. Furthermore, the voltage- time characteristic curve of the cable with such insulation is more horizontal as compared with that of conventional crosslinked polyethylene insulated cable. We have since continued our study on such semiconductive organic liquid inthe process of its application to cable insulationandfound many phenomena. According to our findings, the breakdown voltage is less affected adversely by defects in the insulation and therefore is stable with very little deviation. The cable insulation containing the semiconductive organic liquid has a higher impules breakdown voltage and is free from breakdown at low voltages.