MANHASSET, N.Y. Long Island Power Authority and American Superconductor Corp. have activated a high-temperature superconductor (HTS) power transmission cable system.
The 138-kV system consists of three individual HTS power cable phases running in parallel through the Authority's Holbrook transmission right-of-way. The 2,000-foot-long cable system is cryogenically cooled using a liquid nitrogen refrigeration system.
The system is part of a U.S. Energy Department effort, through its Office of Electricity Delivery and Energy Reliability, to modernize the nation's electricity delivery infrastructure.
DOE previously funded $27.5 million of the $58.5 million total project cost. HTS power cables are envisioned by the DOE as a component of a modern electricity superhighway--one that is free of bottlenecks and can readily transmit power to customers from remote generation sites such as wind farms.
The cable system contains hair-thin, ribbon-shaped HTS wires that conduct 150 times the electricity of similar copper wires. This enables transmission-voltage HTS cables to utilize far less wire while conducting up to five times more power--in a smaller right of way--than traditional copper cables.
When operating at full capacity, the new HTS cable system is capable of transmitting up to 574 megawatts of electricity, enough to power 300,000 homes, according to LIPA.
Long Island Power Authority is the third U.S. electric utility to deploy an HTS cable system in its power grid. In 2006, the National Grid and American Electric Power energized distribution voltage HTS power cable systems in Albany, N.Y., and Columbus, Ohio.