New developments in medium and high voltage cable with laminate sheaths as moisture barriers

The development of medium- and high-voltage cables with moisture barriers as a countermeasure to water treeing is reviewed. The moisture barrie can take traditional forms, including extruded or welded metallic tubes. The latest moisture-barrier cable designs use laminate sheaths. The traditional design approaches and the evolution of the laminate sheath are discussed. The various designs, under-jacket with foil or sheet, or on-core, are described. Design considerations are also discussed. Information on deployment in the field and standardization activities is also included.<>