ABB achieves 1100 kV DC breakthrough

13 December 2017

Transformers and other key equipment to be supplied by ABB for the world’s first 1100 kV UHVDC project have successfully completed a ‘stringent’ test phase. The tests are part of the process of creating record high voltage transformers for the 1100 kV, 3284 km Changji-Guquan UHVDC connector between the Chinese provinces of Xinjiang and Anhui.
This announcement of the successful test runs of the low and high voltage units of the world’s most powerful UHVDC transformer comes hard on the heels of Siemens’ announcement that its own UHVDC transformer, also destined for the Changji-Guquan link, has passed its first type test..
The +/-1100 kV ABB transformer, developed and manufactured in close collaboration with State Grid Corporation of China has passed a series of type tests, paving the way for the implementation of the new link.
Changji-Guquan will set a new world record in terms of voltage level, transmission capacity and distance. It will be capable of transporting 12 GWe, 50 % more than the +/- 800 kV UHVDC links currently in operation. Transmission distance will be extended from around 2000 km to over 3000 km, enabling the integration and transmission of renewables in the north of China on a much larger scale. When fully operational the link will be able to feed eight 500 kV and two 1000 kV AC lines.
ABB’s latest breakthrough is said also to make it possible to connect +/-1100 kV DC with 750 kV UHVAC links for the first time. ABB has also developed and tested a range of other key 1100 kV components, including converter valves, bushings and DC circuit breakers.
“In addition to transporting more power across longer distances with lower losses, this breakthrough will enable the interconnection of AC and DC grids and support the future linking of regions and countries.” said Claudio Facchin, president of ABB’s Power Grids division.

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