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:
Oct. 27, 1992
Filed:
Apr. 05, 1990
Applicant:
Inventors:
Masami Watanabe, Amagasaki, JP;
Noboru Mikami, Amagasaki, JP;
Eiya Aikawa, Tajimi, JP;
Yoshinari Furukawa, Tokoname, JP;
Assignees:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Chubu Electric Power Company, Incorporated, Nagoya, JP;
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
364483 ; 361 42 ; 361 87 ;
Abstract
A zero-phase sequence current detector have three circular cores provided around three phases overhead lines of AC power lines, three magnetoptic sensors provided on respective cores for detecting currents flowing on respective power lines, and a processing circuit containing an adding circuit for adding outputs of the magnetoptic sensors and a compensation processing circuit for canceling erroneous components due to the differences of the temperature characteristics among the magnetoptic sensors.