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. 10, 2012
Filed:
Jun. 17, 2009
Tadashi Koshizuka, Minami-ku, JP;
Minoru Saito, Kamakura-ku, JP;
Koichi Futagami, Midori-ku, JP;
Hiroshi Kusuyama, Izumi-ku, JP;
Yoshimasa Sato, Nakahara-ku, JP;
Tadashi Koshizuka, Minami-ku, JP;
Minoru Saito, Kamakura-ku, JP;
Koichi Futagami, Midori-ku, JP;
Hiroshi Kusuyama, Izumi-ku, JP;
Yoshimasa Sato, Nakahara-ku, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A first calculation part calculates the phase-to-phase steady-state magnetic flux of the three phases of the power supply. A second calculation part calculates the phase-to-phase residual magnetic flux of the three phases in the primary windings side of the transformer when the circuit breakers interrupt the transformer. A phase detection part detects a voltage phase at which polarity and magnitude of the calculated steady-state magnetic flux and residual magnetic flux coincide. Closing control part firstly causes only the circuit breakers of the two phases to close at the detected voltage phase, and then causes the circuit breaker of the remaining one phase to close.