A high-temperature superconducting cable aimed at 5 MW dc-power transmission at 270 V for Department of Defense applications that operate at 55 K has been constructed and successfully tested at 76 K. The flexible cable, which has a outer diameter of only 10 mm, carries a superconducting current of 7550 A during single-phase operation and 3946 A in two-phase operation. The cable is expected to meet Air Force specifications at 55 K in single-phase operation.
Two-phase high-temperature superconducting dc-power transmission cable.
Cable being tested in single-phase mode in liquid nitrogen.
Initial details of the experiment have been presented at the Cryogenic Engineering Conference & International Cryogenic Materials Conference. Final details will be presented at the Superconductivity Centennial Conference.
This work was performed in collaboration with the Air Force Research Laboratory and the National Institute of Standards and Technology.