Rosseti CEO checks operation of the largest DC energy transit based on superconductivity

Andrey Ryumin, CEO of PJSC ROSSETI, checked the operation of a high-temperature superconducting direct current (HTS) cable line, which was previously put into pilot operation in St. Petersburg. This was reported in the company's press service.

The innovative transit with a length of 2.5 km has no analogues in the world among existing facilities. The main feature of HTS is the presence of a superconductor, whose resistance tends to zero when cooled below minus 196 degrees Celsius. The technology allows the transmission of electrical power at an average voltage of 20 kV, typical for 110-330 kV high and ultrahigh voltage networks, without loss of energy during transportation.

According to Ryumin, "the creation of a high-tech line integrated into the existing megalopolis power supply system is a landmark project for the global energy industry." The project was based on the ROSSETI Group's own developments, for which more than 10 patents were obtained. "This experience opens up opportunities for creating a new generation of energy—efficient equipment that can be used in dense urban environments, to power power plants, power large enterprises, and build energy bridges," said Rosseti CEO.

The HTSP line has improved the reliability of power supply to the Central and Admiralteysky districts of the city, where about 400 thousand people live. The innovative transit with the possibility of reverse transmission is laid between 330 kV Central and 110 kV RP 9 substations. It has become an element of an active adaptive network with the ability to regulate power flow and limit short-circuit currents. The capacity of the line is 50 MW. In the implemented project, the length of the cryogenic circuit, through which liquid nitrogen is pumped to maintain the required temperature, is also about 5 km.