Line protector having arrester and fail-safe circuit bypassing the arrester
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United States of America
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Aug 25, 1981
Grant Date -
N/A
app pub date -
Jul 16, 1979
filing date -
Jul 16, 1979
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A line protector has an arrester through which overvoltages on the line of short duration are grounded. The arrester may be of the type having an arc gap sealed within a gas tube. For an overvoltage of longer duration, a pellet is melted causing a spring to close a circuit bypassing the gas tube and provide a direct metallic path from the line to ground. A secondary arc gap between opposed conductors separated by an insulating sleeve has an arc-over voltage that is greater than the normal arc-over voltage of the first-mentioned arc gap and provides a path to ground for short duration overvoltage conditions in the event of failure of the arrester. Excessive current across the secondary arc gap may melt the insulator sleeve and engage the opposed conductors for grounding purposes.
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