Surge voltage arrester with fail-safe feature
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United States of America Patent
Stats
-
Feb 3, 1981
Grant Date -
N/A
app pub date -
Mar 7, 1979
filing date -
Mar 7, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A surge voltage arrester utilizes for surge protection a varistor of the zinc oxide type between a line terminal and a ground terminal. The varistor is of a type that has a resistance which decreases as increasing voltage is applied thereacross. With increasing temperature the leakage current through the varistor increases at a given voltage. At a critical temperature and voltage condition, the varistor is subject to a thermal runaway condition which would cause the varistor to fail expelling hot particles. To avoid this failure condition, a fail-safe mechanism is provided which connects the line terminal to the ground terminal by-passing the varistor when there is an overcurrent condition on the line that results in heating of the varistor.
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