Long high transmission capacity Gas Insulated Lines were studied by a JWG 23/21/33 from 1997 to 2002, which published a Technical Brochure 218 in 2003. Due to the lack of time and to the wide scope of work involved, the issue of installing a GIL in tunnels or bridges was not addressed by this JWG and it was therefore suggested that a new JWG is set up to cover this important issue.
Scope of work :
- GIL installed in specific or shared structures (tunnels, bridges)
- Structures with or without other services (road and railway traffic, piped services, other utilities)
- The voltage range shall be HV and EHV AC.

The WG has been recently disbanded.


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