Gas-insulated single-phase cable for transporting electricity
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United States of America Patent
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Nov 5, 1996
Grant Date -
N/A
app pub date -
Dec 20, 1994
filing date -
Dec 21, 1993
priority date (Note) -
Expired
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Abstract
A gas-insulated single-phase cable for long-distance transport of electricity under high tension, the cable including a cylindrical steel case filled with nitrogen under a pressure of at least 10 hectopascals, an aluminum- or copper-based metal conductor held axially inside the steel case by closed insulating cones, and an aluminum case disposed at a short distance from the steel case and constituting a magnetic screen protecting the steel case from the magnetic field generated by the current carried by the conductor. The steel case is separated from the aluminum case by rings of plastics material or of filled polymer, such as polytetrafluoroethylene. Each rings is placed in a groove in a metal collar, with two adjacent portions of the aluminum case being welded to the collar.
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