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:
May. 18, 1976
Filed:
May. 14, 1974
Applicant:
Inventor:
Venkat Narayan, Spreitenbach, CH;
Assignee:
Brown, Boveri & Co., AG, Baden, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
317 / ; 317 / ;
Abstract
The voltage-to-ground or neutral of one phase conductor of a three-phase line is compared with the mesh or interphase voltage of the other two phases on an amplitude basis and the comparison result is used to trigger a threshold switch if the former is much smaller than the latter. The threshold switch may be connected to the selector of an excitation system of a network protection assembly or a nonselective excitation system may utilize the outputs of the threshold switches for each of the three comparisons, in order to produce selective triggering of a network protection assembly.