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Several HVDC installations are presently undergoing refurbishment, while others have already been through refurbishment, and this paper will review the various strategies being adopted by the owners to extending the life of their plant. The projects covered by the paper include Nelson River (2000 MW Overhead Line Transmission), Konti-Skan Pole 1 (380 MW Cable + Line Transmission), McNeill (150 MW...
The power transmission utility in Uruguay (UTE) has commissioned an HVDC station at the Melo substation to provide a link to the transmission system in Brazil. Uruguay's indigenous hydro power resources have been almost fully exploited and can be an un-predictable source due to prolonged dry seasons. By linking to the much larger Brazilian power system, Uruguay will be able to have access to large...
This paper presents the design of the thyristor valves for the Rowville SVC replacement project. The thyristor valves are based on AREVA's latest developed S500 series valve design and make use of 8.5kV 5" electrically-triggered thyristor technology. Details of the valve configuration, the cooling circuit, as well as the protective strategy are presented. Detailed electrical ratings such as the...
The transmission system operator in Uruguay (UTE) has contracted ALSTOM Grid to build a 500MW inter-connector with Brazil. As the 500kV transmission system in Uruguay operates at 50Hz and the Brazilian 525kV transmission system operates at 60Hz, HVDC becomes the most appropriate technology to inter-connect the two grids. This paper provides details of the design of the new 500MW HVDC back - to back...
The paper describes the project to refurbish the Konti-Skan HVDC Link between Sweden and Denmark, which included the replacement of the existing Pole 1, and the addition of top level bipole controls for both the refurbished Pole 1 and the existing Pole 2. The complex project included working in 2 different countries with 2 different client utilities, each requiring different scopes and with 2 contracts...
Ice accumulation on transmission lines in extreme climatic events can result in severe damage to the lines and towers, with the possibility of being unable to restore the service quickly enough to preserve electricity supplies to customers. To prevent such a situation, Hydro-Quebec TransEnergie are investing in a dedicated "De-icer" installation at its strategically important Levis substation,...
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