10,000 MW DC transformer saves power losses

ABB developed and tested a 1100 kV ultra-high-voltage direct current converter transformer. It is claimed to break the record for the highest DC voltage levels ever and facilitates an increase in power that could be transmitted efficiently over longer distances.

The Xiangjiaba-Shanghai link, commissioned by ABB was said to be the world’s first commercial 800 kV UHVDC connection. It has a capacity of 6400 MW and covers a distance of just over 2000 km, making it the longest of its kind in operation.

The new transformer will make it possible to transmit more than 10,000 megawatts (MW) across distances up to 3000 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 1100 kV transformer addressed several technology challenges such as the sheer size and scale, electrical insulation, including bushings, and thermal performance.