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Siemens receives order to deliver world’s first 1,100 kV HVDC transformers

Siemens is manufacturing the transformers in its network of factories led by its transformer plant in Nuremberg, Germany, in cooperation with its factory for HVDC transformers in Guangzhou, China. The scope of supply also includes special converter transformers, which can be connected directly to China’s 1,050 kV AC grid, which worldwide never has been realized in this way before.
“With our transformers and our technology, we support a global power grid, called Global Energy Interconnection, GEI,” said Beatrix Natter, CEO of the Transformers Business Unit within the Siemens Energy Management Division. “In this way, we are also helping to interconnect the global ultra high-voltage three-phase grids and ultra high-voltage DC grids on the 1100 kV DC and 1050 kV AC level.”
Siemens completely redesigned all key components of its 1,100 kV converter transformers on the basis of many years of experience constructing HVDC transformers. In manufacturing these kinds of transformers, the company is entering a new dimension in HVDC technology. The Changji-Guquan system will transmit power with a transmission voltage of 1,100 kV DC for the first time worldwide. As core components of every HVDC transmission system, the converter transformers are responsible for converting the voltage of the three-phase grid into 1,100 kV transmission voltage in order to supply the converters.
“Our transformers for cutting edge HVDC transmission project in China have positioned us as the industry leader,” Natter said. “The innovations being implemented here will benefit our entire product range.” In developing the 1,100 kV converter transformers, the main goal was to meet the extraordinarily stringent requirements imposed on the insulation systems of these high-tech transformers at a voltage level of 1,100 kV. For example, the two valve bushings through which the current flows from the interior of the transformers into the converters are approximately 19 meters long, due to the necessary insulation clearance in air. With bushings, the transformers are 37.8 meters long, 5.85 meters high and 5.20 meters wide. With insulating oil, they weigh 823 metric tons, and the transport weight is 490 metric tons.
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Siemens Energy is one of the world’s leading energy technology companies. The company works with its customers and partners on energy systems for the future, thus supporting the transition to a more sustainable world. With its portfolio of products, solutions and services, Siemens Energy covers almost the entire energy value chain – from power generation and transmission to storage. The portfolio includes conventional and renewable energy technology, such as gas and steam turbines, hybrid power plants operated with hydrogen, and power generators and transformers. More than 50 percent of the portfolio has already been decarbonized. A majority stake in the listed company Siemens Gamesa Renewable Energy (SGRE) makes Siemens Energy a global market leader for renewable energies. An estimated one-sixth of the electricity generated worldwide is based on technologies from Siemens Energy. Siemens Energy employs more than 90,000 people worldwide in more than 90 countries and generated revenue of around €27.5 billion in fiscal year 2020.

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