Method of discriminating between an internal arc and an interruption arc detected inside a metal-clad electrical installation
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United States of America Patent
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Jun 8, 1999
Grant Date -
N/A
app pub date -
Dec 15, 1997
filing date -
Dec 16, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of discriminating an arc detected in metal-clad equipment includes detecting an arc, generating an arc-appearance signal, transmitting the arc-appearance signal to a computer, and determining a time lapse T. The time lapse T is determined according to the formula t.sub.o -t.sub.a ; t.sub.o is an instant at which the computer receives a circuit breaker trigger order, and t.sub.a is an instant at which the arc-appearance signal is first acquired by the computer. The arc is determined to be an internal arc (1) if the time lapse T is positive, or (2) if the time lapse T is negative and its absolute value is less than or equal to 10 ms. On the other hand, if the time lapse T is negative and its absolute value is greater than 10 ms, variation of the arc-appearance signal is analyzed to discriminate the arc.
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