ABB develops most powerful HVDC transformer [August 2012]

Power and automation technology group, ABB, has developed and tested a 1,100 kV ultrahigh-voltage direct current (UHVDC) converter transformer breaking the record for the highest DC voltage levels ever, and facilitating more power to be transmitted efficiently over longer distances.
The Xiangjiaba-Shanghai link, commissioned by ABB was the world`s first commercial 800 kV UHVDC connection. It has a capacity of 6,400 MW and covers a distance of just over 2000 kms, making it the longest of its kind in operation. The new 1,100 kV converter transformer technology will make it possible to transmit more than 10,000 MW of power across distances as long as 3,000 km.
Higher voltage levels allow larger amounts of electricity to be transported across very long distances with minimal losses using HVDC technology. Converter transformers play a critical role in HVDC transmission serving as the vital interface between the DC link and the AC network. Development of the 1,100 kV transformer addressed several technology challenges such as the sheer size and scale, electrical insulation including bushings and thermal performance parameters.
“This new 1,100 kV transformer technology will make it possible to transmit even more electricity efficiently and reliably, at higher voltage levels, across greater distances with minimum losses,” comments Bernhard Jucker, head of ABB’s Power Products division. “Technology and innovation are at the core of ABB’s culture and this is yet another example of our pioneering spirit.”

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