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High Capability Applications of Long Gas-Insulated Lines in Structures

The paper deals with the possibility of installing gas insulated transmission lines (with acronym GIL) in dedicated or shared structures. The applications involve railway galleries (both in the proper galleries and in service or pilot tunnels), highway networks, 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 is shown in this paper (steady-state regime of the line, voltage drops, power losses, voltage unbalance factor, ampacity, electro-magnetic field impact and limit lengths): moreover, the 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 towards a feasible technical solution