In Denmark a massive project is under way to install underground UHV power transmission lines to replace aerial lines. In Phase I of this project Furukawa Electric has developed epoxy-unit prefabricated joints (PJs) for 420-kV XLPE cable. Prior to delivery, the PJs successfully passed type approval tests according to IEC standards as well as a 1-year loading test at CESI (Centro Elettrotecnico Sperimentale Italiano). Cable connection work began in April 1996 involving the installation of 72 phases, and the line went into commercial service in October 1997. These PJs are the first in this voltage class to be used with XLPE cable on long-distance lines.
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