ABB: world’s most powerful HVDC power transformer passes test

2017-12-08 - ABB has announced the successful testing of the low and high voltage units of the world’s most powerful ultrahigh-voltage direct current (UHVDC) transformer. Power Transformer News article - December 7, 2017
According to a company statement, the +/-1,100 kV (1.1 million volts) UHVDC transformer, developed and manufactured in close collaboration with State Grid Corporation of China (SGCC), has successfully passed a series of type tests, paving the way for the implementation of the Changji-Guquan UHVDC link, which will transmit power from the Xinjiang region in the Northwest, to Anhui province in eastern China.

Changji-Guquan, the world’s first +/-1,100 kV UHVDC link will set a new world record in terms of voltage level, transmission capacity and distance. It will be capable of transporting 12,000 megawatts of electricity – the equivalent of 12 large power plants and 50 percent more than the +/- 800 kV UHVDC links currently in operation. Transmission distance will be extended from around 2,000 kilometers (km) to over 3,000 km, enabling the integration and transmission of remote renewables on a much larger scale.

When fully operational this UHVDC link will be able to feed eight 500 kV and two 1,000 kV AC lines – delivering power equivalent to twice the average annual power consumption of Switzerland. ABB’s latest breakthrough also makes it possible to connect +/-1,100 kV DC with 750 kV UHVAC links for the first time. In addition to the transformer, ABB has also developed and successfully tested a range of other key +/-1,100 kV components, including converter valves, bushings and DC circuit breakers.

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