Surge arrester with overvoltage sensitive grounding switch
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United States of America Patent
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Dec 10, 1996
Grant Date -
N/A
app pub date -
Nov 10, 1994
filing date -
Nov 10, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A surge arrester for protecting power distribution equipment from overvoltages has a varistor as the active surge-arresting element. In the event of a persistent overvoltage, an amorphous conductor electrically in series with the varistor heats up to or above a critical temperature at which its tensile strength substantially decreases. The amorphous metal conductor breaks, triggering a series of events including the closing of a switch creating a permanent short to ground, operating the network overcurrent protection to de-energize the arrester and associated protected equipment, and protecting the electrical network equipment from insulation damage and/or failure because of a sustained or permanent power frequency overvoltage condition.
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