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:
Jun. 12, 2012
Filed:
Mar. 30, 2007
Applicant:
Kempei Seki, Chiyoda-ku, JP;
Inventor:
Kempei Seki, Chiyoda-ku, JP;
Assignee:
Mitsubishi Electric Corporation, Chiyoda-Ku, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R 27/28 (2006.01); G01R 25/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
Voltage instantaneous value time-series estimation data and a present-time voltage estimation value are calculated by using an actually-measured frequency and voltage instantaneous value time-series data according to a least square method. A present-time voltage effective value is determined by using the calculated voltage instantaneous value time-series estimation data, and a present-time synchrophasor, a voltage distortion degree and an inter-bus-line synchrophasor phase angle difference are determined by using the present-time voltage effective value and the present-time voltage estimation value.