High frequency characteristics of a shielded medium voltage XLPE cable

Knowledge on how wave propagation characteristics and other parameters depend upon cable design is an important base in establishing diagnostic methods for cable insulation. In this study, a shielded medium voltage XLPE cable is investigated and a high frequency based measurement technique is used to measure the properties of the cable material, particularly the semi-conducting screens, in the frequency range 1 kHz to 1 GHz. A materials model is then developed based upon these measurements and this is incorporated into a model for the whole cable. The results are then compared with those obtained from time domain measurements carried out on the XLPE cable.