Device for measuring circuit breaker wear

Details Device for measuring circuit breaker wear Device for measuring circuit breaker wear

1995-01-20

1997-02-18

Regan, Maura K.

Electricity: measuring and testing

Electromechanical switching device

Circuit breaker

340638, 361113, G01R 3102

Patent

active

056044372

ABSTRACT:
A device for measuring circuit breaker wear by integrating the square of the current to be interrupted, said circuit breaker including a control that is actuated by a trip coil. The device includes a timing delay circuit that is actuated by a signal corresponding to a change in the driven or non-drive state of the trip coil, the timing delay circuit causing integration to begin after time has elapsed that is equal to the mechanical delay of the circuit breaker, which mechanical delay is a previously-measured data item. The device further includes a circuit that delivers a signal proportional to the current carried by the circuit breaker, a circuit that squares the signal, and that applies said square to the integrator, said integration being performed for a given length of time that is longer than the maximum arcing time of the circuit breaker, which maximum arcing time is likewise a previously measured data item, the result of the integration being applied to a summing circuit.

REFERENCES:
patent: 3373350 (1968-03-01), Reece
patent: 3735201 (1973-05-01), May
patent: 4351013 (1982-09-01), Matsko et al.
patent: 4620156 (1986-10-01), Alvin et al.
patent: 4670812 (1987-06-01), Doefler et al.
patent: 4780786 (1988-10-01), Weynachter et al.
patent: 4808843 (1989-02-01), Hedin
patent: 5223795 (1993-06-01), Blades
Patent Abstracts of Japan, vol. 017, No. 480 (E-1425) 31 Aug. 1993 & JP-A-05 120 945 (Toshiba) 18 May 1993.
Patent Abstracts of Japan, vol. 015, No. 507 (P-1291) 20 Dec. 1991 & JP-A-03 220 471 (Mitsubishi) 27 Sep. 1991.
French Search Report FR 9401072.

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