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. 14, 1978
Filed:
Aug. 26, 1976
Applicant:
Inventors:
Takayuki Kobayashi, Fuchu, JA;
Shigeru Suzuki, Fuchu, JA;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 78 ; 361 80 ;
Abstract
A static circuit comprising an input transformation circuit responsive to current or voltage derived from an electric power system to be protected for producing a first pair of electric quantities having a phase difference of .theta. and a second pair of electric quantities dephased by .phi. from the first pair of electric quantities respectively, a pair of multipliers for the producing products of the first and second pair of electric quantities, and an adder or subtractor for producing the difference of these products.