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. 24, 1990
Filed:
Jun. 08, 1989
Sunao Suzuki, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A method of detecting amplitude value of AC electric quantity in electric power system, where five sampling values obtained in sampling performed in sequence at a period of 1/4 of the period of the rated frequency of the AC electric quantity are used, and the first through fifth sampling values are squared respectively and the squared values of the second and fourth sampling values are multiplied by four and the squared value of the third sampling value is multiplied by six and the sum total of these values is obtained, and then the sum total is divided by eight and its square root is estimated, thereby the amplitude value of the AC electric quantity is obtained. Even if the frequency of the AC electric quantity to be detected is varied about .+-.5%, its amplitude value can be operated with good accuracy and the operation result can be obtained at high speed.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile