XLPE materials for extruded high/extra-high voltage transmission cables

High quality high voltage and extra-high voltage extruded dielectric transmission cables can be made with the use of appropriate insulation and semiconductive materials and with special processing equipment. The requirements for the cleanliness of the insulation products are defined. The methods required to produce, test and maintain high levels of cleanliness are also elucidated. The criticality of the smoothness of the semiconductive conductor shields is described and the methods used for producing and testing these shields are also explained. Cable data showing excellent transmission properties for these extruded dielectric cables are presented.