The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 06, 1987
Filed:
Oct. 19, 1984
Alan B Shimp, Monroeville Boro, PA (US);
Derek A Paice, Murrysville Boro, PA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
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.