(XVIII SNPTEE - NATIONAL SEMINAR FOR ELECTRIC POWER PRODUCTION AND TRANSMISSION - 2005)
Filipe Guerra Soares, Paulo Ricardo Ralo Liberato da Silva, Reynaldo Castriota de Mello, Sírio José Ferreira, Evanildo Ramos Ribas, Kleber Ribeiro dos Santos, João Felix Nolasco
ANEEL bidding processes for the concession of transmission lines, open to the participation of private companies, promoted an intense search for engineering solutions focused on maximum efficiency understood as the lowest possible project cost including installation, losses and risk of penalties applied by the inspection departments. Thus, in regards to the structures, a highly representative component in line cost and reliability, the participant companies have been making an effort to develop innovative solutions or to improve the traditional ones so that they bring competitive advantages into the projects in which they take part. In that context, Companhia Transleste de Transmissão S/A, a partnership consisting in ALUSA, CEMIG, FURNAS and ORTENG, which won the concession contract for the Montes Claros 2 - Irapé 345 kV TL (an extension of 138.5 Km) in an auction carried out by ANEEL in the end of 2003, with a discount of 34% on the maximum annual revenue allowed, looked for a structural solution that attended to all the electric parameters required in ANEEL bidding documents and that would allow for achieving return rates aimed at, despite the high discounts. LEME, JFNOLASCO and ENGETOWER were then engaged to develop the electric studies, the studies for the optimization of a monopole cat head cable-stayed structural solution, the basic design, the structure executive design and the TL electromechanical design, all of them adjusted to the technical and economic needs of a successful project. This Technical Bulletin describes the electric, mechanic, structural and economic aspects related to this design solution and presents some of the results obtained from its application to the transmission line referred to.
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