Manufacture and Installation of a Three Conductor SF6 Insulated Transmission Line

Development of EHV three conductor SF6 insulated transmission systems has progressed to the stage where a field demonstration has been initiated. Details of 362 kV transmission system design and manufacture are presented. The 180 m (600 ft) buried and above ground test loop design, field installation and instrumentation systems are detailed. A long term test program is outlined. Further developments including a post installation economic evaluation will be described in the future.