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:
Mar. 30, 1976
Filed:
May. 23, 1974
David R Smith, McKeesport, PA (US);
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Abstract
A network protector relay having trip characteristics which respond not only to the direction of the flow of positive-sequence power through the breaker outwardly of the network but which will respond to unbalanced and simultaneous faults in the feeder network as well. The network protector relay in addition to its tripping characteristics includes closing characteristics which will permit the automatic closing of a breaker only when the phase sequence of the feeder is the same as that of the network, there is a proper phase relationship between the network and feeder and the magnitude of the feeder voltage is such that power flow will be in a direction toward the network.