High-voltage circuit-breaker including a valve for decompressing a thermal blast chamber
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United States of America Patent
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Jun 1, 2004
Grant Date -
Sep 18, 2003
app pub date -
Mar 12, 2003
filing date -
Mar 18, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A high-voltage circuit-breaker including a valve for decompressing a thermal blast chamber includes two contacts disposed in a breaking space which is delimited by a blast nozzle and contains a dielectric gas. It further includes a thermal blast chamber which communicates with the breaking space via a throat of the nozzle and with an expansion space via an evacuation passage which can be shut off by a valve. The valve opens when the pressure in the thermal blast chamber is greater than a particular threshold to evacuate the pressurized gas from the chamber. The evacuation passage is formed in the nozzle and defines a circular volume within the thickness of the nozzle, following its general shape, and opening into the expansion space downstream of the breaking space relative to the throat.
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