Electrical switching apparatus and method employing acoustic...

Details Electrical switching apparatus and method employing acoustic... Electrical switching apparatus and method employing acoustic...

2008-07-22

2008-07-22

Nguyen, Tai T (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S636120, C340S636170, C340S638000, C340S644000, C340S650000, C340S652000, C340S664000, C324S527000, C324S528000, C324S529000, C361S042000, C361S093200

Reexamination Certificate

active

11431332

ABSTRACT:
A circuit breaker includes a first lug and second and third acoustic lugs electrically connected to a power circuit. Separable contacts are electrically connected in series between the first lug and the second acoustic lug. An operating mechanism opens and closes the separable contacts. A first acoustic sensor is coupled to the second acoustic lug and senses a first acoustic signal from the second acoustic lug. A second acoustic sensor is coupled to the third acoustic lug and senses a second acoustic signal from the third acoustic lug. The first and second acoustic signals are operatively associated with a power circuit fault. A current sensor senses a current flowing between the first and second lugs. A circuit inputs the sensed acoustic signals and the sensed current and detects and distinguishes a parallel arc fault or a series arc fault from the sensed acoustic signals and the sensed current.

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