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:
Jul. 07, 1992
Filed:
Oct. 26, 1990
Applicant:
Inventor:
Naoki Ochi, Amagasaki, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G01R / ; G01R / ;
U.S. Cl.
CPC ...
324 96 ; 3241 / ;
Abstract
An optical instrument transformer can measure both current and voltage of the primary conductor. Measurement of current is made through modulation effect of a light signal by the optical magnetic-field sensor, and measurement of voltage is made through modulation effect of a light signal by the optical electric-field sensor, by measuring the voltage between a conductor member and an upper flange the of the a bushing, which has a value divided in a dividing ratio determined by the capacitance between the conductor member (4a) and the upper flange and the capacitance between the upper flange and ground.