Analysis of a MV XLPE Cable Termination Design with Embedded Electr

Insertion of embedded electrodes (EEs) inside a MV XLPE cable termination strongly affects electric field around the termination and accordingly must be carefully considered. In this paper, influence of embedded electrodes on voltage distribution in some constructions of the 20 kV cable terminations was analyzed. Different options were considered for a specific number of the EEs along the cable insulation surface, taking into account possible effects of floating or grounded EEs, their different position and separation. In every option, a basic method of stress relieving with resistive layer over the end of semi conducting screen and primary cable insulation was applied. Reference design was a cable termination without EE. Its voltage distribution, total electric field and tangential component were observed for comparison. The stress relief materials, in the shape of pads or tubes, were used. Their properties were kept the same in all constructions. Voltage distribution was monitored, starting from the end of the primary cable insulation in the vicinity of the phase conductor and ending at the cable insulation attached to the semiconducting screen end at ground potential. The different design options were experimentally verified