220 kV gas-insulated transmission line-Palexpo Geneva Switzerland

This paper describes the first application in Geneva of the second generation GIL developed using N₂/SF₆ gas mixtures. An existing high-voltage overhead transmission line had to be replaced because of the extension of buildings for the Palexpo fairs. The existing 220 kV line had to be laid underground for a length of about 420 m, mainly due to specified limits of the magnetic field in the exhibition area. An advantage of GIL in this context is that the transmission behaviour is quite similar to overhead lines. Additionally, gas-insulated lines are also suitable for autoreclosure functions on the complete line.