Monitoring device for a gas-insulated cable
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United States of America Patent
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Jul 27, 1999
Grant Date -
N/A
app pub date -
Oct 14, 1997
filing date -
Oct 14, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A gas-insulated cable includes a plurality of sections separated by sealed partitions, each section including a cylindrical steel case, a cylindrical aluminum screen coaxial with and inside the case and three conductors. A monitoring device includes, between the case and the screen, optical fibers equal in number to the number of sections of the cable and extending from one end to the other of the cable, each of the sections being monitored by a single fiber. The monitoring device further includes at least one optical internal arc detector inserted in series into each fiber in the corresponding monitored section, at each end of the device, a device for detecting light conveyed by the optical fibers, and at least one optical threshold temperature detector inserted in series into each fiber in the corresponding monitored section.
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