Method of discriminating between an internal arc and an interrup

Details Method of discriminating between an internal arc and an interrup Method of discriminating between an internal arc and an interrup

1997-12-15

1999-06-08

Elms, Richard T.

Electricity: electrical systems and devices

Safety and protection of systems and devices

361 42, 361 78, H02H 300

Patent

active

059108720

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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