HV overhead line-the Scandinavian experience

Experience in both laboratory and practical situations in Finland, Sweden and Norway appears to confirm the advantages of 11/12 kV and 22/24 kV BLX covered overhead lines compared with conventional bare conductor (BLX is taken from the Norwegian 'Belagt Linesystem', or overhead line system, insulated with XLPE.) The line consists of a stranded, alloyed aluminium conductor with cross-section from 50 mm/sup 2/ to 150 mm/sup 2/, covered with a cross-linked and UV resistant polymer. The conductor is grease filled during the manufacturing process to make the covered cable watertight and corrosion proof. The development has taken off very quickly in Norway and Sweden since ABB Norsk Kabel launched BLX in 1989. The author discusses the construction of the lines, lightning protection, and the benefits of the BLX overhead lines.<>