What is the power cable accessories used to do?
Semi-conductive shield The semi-conductive shield is usually disposed on the outer surface of the conductive core and the outer surface of the insulating layer, referred to as the inner semiconducting shield and the outer semiconducting shield, respectively The semiconducting shield is made of a semi-conductive material with a low resistivity and a low thickness Internal semiconducting shielding layer is to uniform the outer surface of the electric field, to avoid the conductor surface is not smooth and the core stranded by the air gap caused by the conductor and insulation occurred partial discharge The outer semiconducting shield is in good contact with the outer surface of the insulating layer and is electrically connected with the metal sheath to avoid partial discharge of the metal sheath due to defects such as cable insulation surface cracks For non-metallic jacket in the low-voltage power cable, in addition to the semi-conductive shielding layer, but also to increase the metal shield Metal shield is usually made of copper or copper wire wrapped around the main play the role of shielding the electric field
The shield has two types of semi-conductive shield and metal shield
Shield For uniform conductive wire and insulated electric field, 6kV and above in the high-voltage power cables generally have a conductive shield and insulation shield, part of the low-voltage cable is not set shield
