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ABB wins orders of over $300 million for world’s first 1,100 kV UHVDC power link in China

ABB has won orders worth over $300 million to supply technologies for the world’s first 1,100 kilovolt (kV) ultra-high-voltage direct current (UHVDC) transmission link. The orders were booked in the second quarter of 2016. The Changji-Guquan UHVDC link will transmit power from the Xinjiang region in the Northwest to Anhui province in eastern China and 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, a 50% increase in transmission capacity, compared with the 800 kV UHVDC links currently in operation. This will also help extend the transmission distance from around 2,000 kilometers (km) to more than 3,000 km and play a key role in integrating remote renewables on a large scale, transmitting power over greater distances and facilitating a more interconnected grid.


ABB supplies include advanced converter transformers and components such as bushings and tap changers. ABB will also supply the HVDC converter valves, DC circuit breakers, wall bushings and capacitors as well as provide system design support. The transformers will be among the most powerful in the world, meeting the most stringent performance, reliability and safety standards.

Each transformer weighs 800 tons, measuring 32 meters in length. ABB’s state-of-the-art transformer manufacturing and testing facility in Chongqing as well as the local HVDC engineering and technology center will be actively involved in the delivery and execution of the project.

China has major load centers in its eastern region, while a significant amount of its energy resources are in the west and northwest. The expansive geography and increased demand over the last decade have prompted the build-up of UHV capacity to transmit larger amounts of power over greater distances with minimum losses. Ultrahigh voltage technologies are a key focus area of our Next Level strategy, and our technology advancements in this area are making it possible to increase power transmission capacity and distance to an unprecedented level with minimal transmission losses.

—Claudio Facchin, President of ABB’s Power Grids division

UHVDC transmission is an advancement of HVDC, a technology pioneered by ABB more than 60 years ago, and represents the biggest capacity and efficiency leap in more than two decades.

In 2010 ABB supported SGCC with the Xiangjiaba-Shanghai project, the world’s first 800 kV UHVDC link to go into commercial operation. A few years later, ABB was the first to successfully develop and test 1,100kV converter transformer technology breaking the record for the highest DC voltage levels to date.



This world record 1,100 KV UHVDC link, with 12,000 megawatts capacity, will greatly reduce transmission loss and will transport e-energy further at lower cost.

Would be ideal for North-South and East-West national grids in Russia, USA and Canada.


The pacific intertie is one prime example of DC overlong distance. Bringing down the power from the Columbia gorge including the Grand coulee damn 7GW. 5 of which is destined to LA.


What type of losses do they get over the HVDC compared to conventional power lines today?

James McLaughlin

Fault mitigation must be interesting. A 12 GW step function could be rather destabilizing to thegrid. I wonder how many conductors are carry that? Seems like nearly 11,000 amps...


It is roughly 11,000 amps.  It's going to be interesting to watch this to see what kind of consequences fall out over time.  The advocates of ruinables are all a-flutter over the potential tripping of a single 1.1 GW nuclear plant, but the impact of 11 times that much power being lost from a 12 GW HVDC line doesn't seem to get them excited since the source is supposed to be what they favor.  We will see if and how it works, hmm?

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