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This paper deals with the possibility of installing gas-insulated transmission lines (GILs) in dedicated or shared structures. The applications involve railway galleries (both in the proper galleries and in service or pilot tunnels), highway networks, and gas lines. The high GIL power capability together with very low power losses configures these applications as high transmission efficiency corridors. Some issues of this application will be shown in this paper (steady-state regime of the line, voltage drops, power losses, voltage unbalance factor, ampacity, electromagnetic field impact, and limit lengths). Moreover, this paper discusses the necessary studies to be carried out and the problems that have to be faced in order to develop this kind of application toward a feasible technical solution. Index Terms--Extremely high voltage (EHV) transmission lines, gas-insulated lines (GILs), multiconductor matrix algorithm, shared structures.

This paper deals with the possibility of installing a double-circuit gas insulated transmission line (GIL) in the pilot tunnel of the planned new railway galleries Bolzano (Italy) Innsbruck (Austria). This EHV transmission line could represent a new fundamental step in reconstructing the transnational networks. The high GIL power ratings together with very low power losses would be a strong and highly efficient transmission tie between Italy and Austria particularly useful for the future European Market. The steady-state regime of the line and the electro-magnetic field impact are analyzed. Moreover, the paper discusses the necessary studies to be carried out and the problems that have to be faced. Index Terms--EHV transmission lines, Gas insulated lines, interconnections, multiconductor matrix algorithm, transnational networks.