HVDC Troll

The HVDC Troll is a dual bipolar high voltage direct current transmission system between the oil rig Sea Troll of Statoil and the Norwegian Kollsnes. It is the first application in which an offshore rig land is supplied with a HVDC transmission.

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The plant was built by Asea Brown Boveri. Came into use, as first in the HVDC Gotland in 1999, the variant HVDC Light ABB, with water-cooled IGBT (2.5 kV/500 A) steuerndem electronic element. The construction contract was concluded in 2002. Already in 2004, the installation was completed, and in February 2005 the electrical tests were completed. Fully operational, the total complex since 1 October 2005.

The transmission has a length of 68 km. At -60 kV operating voltage an electrical output of 84 MW is being transmitted. The transmission medium is a triple extruded polymer submarine cable is used, this is voltage up to 150 kV and has a cross section of 300 mm ². The maximum burial depth is 350 m. The feed to Kollsnes done by transformers, each 56 MVA with a static rectifier, where the supply voltage is 132 kV. The plant is used for the energy supply of natural gas compressors that are driven by high-voltage synchronous motors of 56 kV operating voltage on the rig. It can be dispensed with a transformer on the rig.

• Oil and gas industry (Norway )
• HVDC submarine cable
• Oil production in the North Sea
• Built in the 2000s