Siemens has secured an order from National Grid to supply transformers the 2GW high-voltage direct-current (HVDC) link between France and England.

Under the contract, the company will deliver four 400 kV HVDC transformers to replace the old transformers for cross-channel link.

The contract includes the supply, installation and commissioning of the transformers for the Sellindge converter station in England.

Siemens expects to complete the work by mid-2019.

Siemens transformers business unit CEO Beatrix Natter said: “These new HVDC transformers will enable our customer to raise its system to a new level of energy efficiency and reliability.

The company will manufacture all four transformers at the Nuremberg transformer factory, which produces HVDC transformers of all sizes up to a voltage level of 1,100kV.

The 73km link can supply electricity up to 3 million homes on the English side alone. The cross-channel link transmits most of its energy from France to the UK.  

 Siemens said: “High-voltage direct-current transmission is characterized by significantly lower transmission losses than alternating-current transmission. The HVDC cross-channel link technology thus makes it possible to efficiently exchange energy in both directions via subsea cables across the English Channel.”

 In November, Siemens announced successful completion of testing of its first 1,100 kV transformer, which is developed for the high-voltage direct-current (HVDC) transmission link in China.

The transformer has been designed and developed by Siemens for the HVDC transmission link, which will be operated by the transmission grid operator State Grid Corporation of China (SGCC).

With a transmission capacity of 587MVA, the prototype transformer has been tested by Siemens at it transformer factory in Nuremberg, Germany, for its functionality, emissions and load level.

Image: 400 kV HVDC transformers for the Sellindge converter station from the Nuremberg transformer factory.. Photo courtesy of Siemens AG.