Method of discriminating between an internal arc and a circuit-breaking arc in a medium or high voltage circuit breaker
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United States of America Patent
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May 22, 2001
Grant Date -
N/A
app pub date -
Sep 14, 1999
filing date -
Sep 15, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The method relates to discriminating between an internal arc and a circuit-breaking arc established in the enclosure of a circuit breaker in a bay of a medium or high voltage metal-clad substation. The appearance of an internal arc is detected by a protection system which responds by transmitting a disengagement order to the circuit breaker, thereby causing a circuit-breaking arc to appear. The pressure of the dielectric gas inside the enclosure of the circuit breaker, is continuously measured and recorded so that after the instant at which the disengagement order is transmitted, it is possible to recover a first pressure value measured before the instant. The first pressure value is then compared with a second pressure value measured after the said instant in order to identify whether the internal arc was struck in the circuit breaker enclosure.
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