A project involving laying a 730 km high-voltage direct current transmission line and a 670 km undersea cable for the 2, 400-megawatt Sabah Electricity Sdn Bhd ( SESB ).
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The electrical connections power low voltage motors via a DC intermediate circuit and the power converter systems are comparable to those found in plants used in the high-voltage direct current transmissions application.
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However, the study and current operating technology show that electricity losses using high-voltage direct current transmission amount to only 3 % per 1, 000 km ( 10 % per 3, 000 km ).
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Near the end of World War II, as part of the Elbe-Project, the world's first high-voltage direct current transmission lines were built from a power plant in Dessau, on the Elbe river, to Marienfelde.
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In July 2012 the World Bank approved a US $ 684 million loan for an Eastern Electricity Highway Project that will finance a 500 Kilovolt High Voltage Direct Current transmission line between the Wolayta / Sodo substation in Ethiopia and the Suswa substation in Kenya.
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Power electronic devices such as the mercury-arc valve and thyristor made high-voltage direct current transmission practical by improving the reliability and efficiency of conversion between alternating and direct current, but such technology only became possible on an industrial scale starting in the 1960s.
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This project seeks to bring 500-MW of power to the Long Island power grid via an underground high-voltage direct current transmission cable which would connect the Deans Substation in South Brunswick, New Jersey to the Ruland Road Substation in Huntington, New York.
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Siemens energy-related products include gas and steam turbines; generators; compressors; on-and offshore wind turbines; high-voltage transmission products; power transformers; high-voltage switching products and systems; alternating and direct current transmission systems; medium-voltage components and systems; and power automation products.
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:An article in this month's " Scientific American " suggests that high-voltage direct current transmission technology will become increasingly important as more and more energy is generated from renewable resources in remote locations and has to be distributed over longer distances to reach major population centres; that might make an interesting research topic.
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