06-05-2011, 11:50 AM
Abstract
The paper deals with the possibility of installing adouble-circuit gas insulated transmission line (GIL) in the pilottunnel of the planned new railway galleries Bolzano-Innsbruck.This EHV transmission line could represent a new fundamentalstep in reconstructing the transnational networks. The high GILpower ratings together with very low power losses would be astrong and highly efficient transmission tie between Italy andAustria particularly useful for the future European Market. Thesteady-state regime of the line and the electro-magnetic fieldimpact are analysed. Moreover, the paper discusses the necessarystudies to be carried out and the problems that have to be faced.
Index Terms—Gas Insulated Lines, Interconnections,Multiconductor Matrix Algorithm, Transnational Networks,EHV transmission lines.
I. INTRODUCTION
THE opportunity to develop common corridors in order tosatisfy the ever-growing exchanges between areas of bigindustrialised systems is underlined in [1] that states:COMMON CORRIDORSFor both ecological and economic reasons futureexpansion of transmission systems especially near urban areaswill have to consider sharing their rights-of-way with otherland users. Independent use of land by single utilities can leadto inefficient use of natural resources. Development of newrights-of-way in future years will have to consider the locationof suitable highway networks, gas lines, sewage systems,nearby utility transmission lines, telephone lines, undergroundtransmission systems, and recreational areas. Suchdevelopment will require a coordinated effort by thegovernment and industry. A current study in Reference [2]outlines the approach that the electric utilities may follow toencourage full use of their transmission line corridors. This EPRI idea regarding USA, even if with wide territoryresources, is very well applicable to the planned projects ofrailway (or highway) paneuropean galleries.In this view, the planned alpine tunnels for the new railwaylink Bolzano-Innsbruck offer an extremely interestingpossibility to achieve a "multiservice vector"; the greatcompatibility with GIL installations, which are alreadyavailable in the market thanks to new reliable technologies,opens up a significant enhancement of transnational energyexchanges between Italy and Austria (and Germany as well).The rationalisation of fundamental services in the land,such as electricity and transport, represents a higher degree ofconsciousness in conciliating environmental issues andtechnology.In this hopeful context, the project of new galleries betweenItaly and neighbouring countries represents an absolutelyunique opportunity for integrating railway transport andenergy transmission within the same corridor.Moreover, a scarce transnational network between Italy andMember States gives high hindrances to achieve an effectivepaneuropean electric market.Sharing the railway gallery and power transmission linewithin the same corridor satisfies the following requirements:a rationalization of service rights-of-way and a strongerelectrical tie between Italy and Europe.Last but not least, the high environmental compatibility ofGIL, primarily its null visual impact, appears to be fully inharmony with the Alpine Region landscape where an OHLinstallation is today already undesirable. Moreover, thenegligible external magnetic fields are an important feature
.II. THE PROBLEM OF PANEUROPEAN ELECTRICINTERCONNECTIONS
As regards the possibilities and the actual needs ofelectric energy exchanges between Italy and Europe, paper [3]clearly indicates how, as regards Italy, "Low-priced energycan only come from abroad whereas the new interconnectionperspectives are rather difficult".In particular, power exchanges between Italy andAustria are today rather small compared with the powerexchanges with the French and Swiss grids (seetab. 1 and fig. 1).For instance, the electric energy exchanges for the year2001 (like the latest years) [4], depending on the constraintsfor safe operation, are reported in tab. 2 that highlights thelimited possibilities of the 220 kV OHL page link Soverzene-Lienzbetween Italy and Austria.
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