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:
Jun. 20, 1978
Filed:
Jul. 19, 1976
George F Bogel, Pittsburgh, PA (US);
Robert M Oates, Murrysville, PA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
An automatic transfer control device for selectively energizing an electrical distribution system from a pair of electrical power sources. The device includes voltage sensors for sensing electrical conditions on each of the sources. The device may be used on either three-wire or four-wire systems. The voltage sensors comprise an operational amplifier for artificially generating a phase-to-phase voltage from two phase-to-ground voltages. The artificially generated voltage is used to detect sequence reversal on the sources being monitored. Separate means are provided to select a source from which to draw control power for the device, the control power criterion being different from the transfer criterion.