The paper deals with the possibility of installing a 1000 MW power link inside a railway tunnel infrastructure. In particular, the power link should be installed in a train running tunnel, which induces specific constraints like limited available space, limited time access for operation and maintenance of the transmission line due to the railway traffic. The possibility of using a separate emergency tunnel or a pilot one [1, 2] was not in the scope of the project. The actual challenge was to include the cable system whereas the tunnel was originally designed for railway operation only. The paper envisages several technical choices namely AC and DC technologies and demonstrates that the HVDC solution is the only possibility owing to space requirements inside the proper railway tunnel: two poles and a metallic return have been considered for HVDC. The paper highlights only some of the numerous technical issues that have been addressed, in particular: the electro-magnetic field (EMF) impact considering the possibility of installing both poles in the same tunnel or one pole per tunnel; the electro-magnetic compatibility between the high-speed railway supply and the DC link considering the possibility of harmonic contents in the DC-side and the screening effect provided by the metallic pole cable sheath; the safety in case of a pole short-circuit inside the tunnel: theoretical approach and short circuit experimental tests on 300 kV and 450 kV specimens; the transmission line fire behaviour inside the railway tunnel from a theoretical standpoint. This study has been financially supported by the European Community in the framework of TEN-ENERGY Programme: Decisions C(2006)2928&C(2007)3521 – 2005 – E204/05 – TREN/05/TEN-E-S07.59331.
Compatibility between electrical energy transmission lines and new railway infrastructures
BENATO, ROBERTO;
2008
Abstract
The paper deals with the possibility of installing a 1000 MW power link inside a railway tunnel infrastructure. In particular, the power link should be installed in a train running tunnel, which induces specific constraints like limited available space, limited time access for operation and maintenance of the transmission line due to the railway traffic. The possibility of using a separate emergency tunnel or a pilot one [1, 2] was not in the scope of the project. The actual challenge was to include the cable system whereas the tunnel was originally designed for railway operation only. The paper envisages several technical choices namely AC and DC technologies and demonstrates that the HVDC solution is the only possibility owing to space requirements inside the proper railway tunnel: two poles and a metallic return have been considered for HVDC. The paper highlights only some of the numerous technical issues that have been addressed, in particular: the electro-magnetic field (EMF) impact considering the possibility of installing both poles in the same tunnel or one pole per tunnel; the electro-magnetic compatibility between the high-speed railway supply and the DC link considering the possibility of harmonic contents in the DC-side and the screening effect provided by the metallic pole cable sheath; the safety in case of a pole short-circuit inside the tunnel: theoretical approach and short circuit experimental tests on 300 kV and 450 kV specimens; the transmission line fire behaviour inside the railway tunnel from a theoretical standpoint. This study has been financially supported by the European Community in the framework of TEN-ENERGY Programme: Decisions C(2006)2928&C(2007)3521 – 2005 – E204/05 – TREN/05/TEN-E-S07.59331.Pubblicazioni consigliate
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