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. 22, 2016
Filed:
Jul. 22, 2011
Keisuke Udagawa, Chiba, JP;
Tadashi Koshizuka, Saitama, JP;
Minoru Saitoh, Kanagawa, JP;
Yoshimasa Sato, Kanagawa, JP;
Hiroyuki Maehara, Tokyo, JP;
Keisuke Udagawa, Chiba, JP;
Tadashi Koshizuka, Saitama, JP;
Minoru Saitoh, Kanagawa, JP;
Yoshimasa Sato, Kanagawa, JP;
Hiroyuki Maehara, Tokyo, JP;
KABUSHIKI KAISHA TOSHIBA, Tokyo, JP;
Abstract
A residual magnetic flux estimation deviceincludes a DC power-source control devicewhich controls a DC power sourceto apply a DC voltage across two terminals of a Δ connection that is a secondary winding or a tertiary winding, a voltage measuring devicewhich measures a terminal voltage at the primary side of a three-phase transformera computing devicethat determines a phase having a high voltage between the two phases other than the phase to which the voltage is applied, and a residual magnetic flux measuring devicethat measures a phase-to-phase residual magnetic flux between the two phases other than the high-voltage phase, and estimates a measured value of the phase-to-phase residual magnetic flux as a maximum residual magnetic flux in the measurement-target three-phase transformer.