Electricity: measuring and testing – Electromechanical switching device – Circuit breaker
Patent
1984-10-19
1987-01-06
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Electromechanical switching device
Circuit breaker
G01R 3132
Patent
active
046349812
ABSTRACT:
A method for and an apparatus for use in testing a circuit breaker, the circuit breaker having at least one current sensing means, such as a current transformer, trip circuitry, and circuit interruption means. In the method, a low voltage A.C. source is provided; and means for generating an A.C. signal is also provided, the means for generating an A.C. signal having the capability to vary the magnitude of the voltage of the A.C. signal. The low voltage A.C. source is connected with the means for generating an A.C. signal; and the means for generating an A.C. signal is connected with a current sensing means of the circuit breaker. The current sensing means is energized with an A.C. signal; and the magnitude of the current in the A.C. signal is monitored. The magnitude of the current in the A.C. signal and the state of the circuit interruption means in the circuit breaker is compared with a predetermined magnitude of A.C. at which the circuit interruption means in the circuit breaker in proper working condition would be placed in an open state to provide an indication of the condition of the circuit breaker. An apparatus is provided for use in testing a circuit breaker adapted for connection with a low voltage A.C. source and with a current sensing means, such as a current transformer, included in the circuit breaker. The apparatus includes means for varying the magnitude of the voltage of the low voltage A.C. source, and means for varying the magnitude adapted for connection with the low voltage A.C. source.
REFERENCES:
patent: 2657354 (1953-10-01), Van Sickle
patent: 3424958 (1969-01-01), Groat
patent: 3852660 (1974-12-01), Maier
patent: 3924160 (1975-12-01), Maier
patent: 3930187 (1975-12-01), Misencik
patent: 4105965 (1975-08-01), Russell
Saturating Core Devices-Operating Principles and Applications by Leonard R. Crow, May 8, 1950, pp. 98-107.
Paice Derek A.
Shimp Alan B.
Eisenzopf Reinhard J.
Harvey Jack B.
Moran M. J.
Westinghouse Electric Corp.
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