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. 30, 1996
Filed:
Oct. 27, 1993
David J Mrowiec, Rockford, IL (US);
Jef W Good, Beloit, WI (US);
Sundstrand Corporation, Rockford, IL (US);
Abstract
A system of protection for an electric power distribution system which has at least two parallel power feeders for each electrical phase coupling a source of electrical energy through a contactor device to a load distribution bus comprises a controller, and a parallel feeder current sensor for each parallel power feeder which sense electrical current conducted therein. The parallel feeder current sensors produce output parallel current sense signals proportional to the magnitude of the parallel feeder current sensed, and are coupled to the controller by conductors which communicate the output parallel current sense signals thereto. The controller comprises circuitry which compares the magnitudes of the output parallel current sense signals for each electrical phase. This comparison circuitry generates a first output protection signal when the magnitudes of the output parallel current sense signals differ by at least an amount sufficient to indicate a high impedance fault on at least one of the parallel power feeders. The protection system further comprises circuitry to isolate the high impedance fault by opening the contactor device and de-energizing the source of electrical energy.