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:
Sep. 16, 1997
Filed:
Apr. 18, 1996
Hiroki Ito, Tokyo, JP;
Takashi Moriyama, Tokyo, JP;
Kenji Kamei, Tokyo, JP;
Suenobu Hamano, Tokyo, JP;
Etsuo Nitta, Tokyo, JP;
Naoaki Takeji, Osaka, JP;
Koji Yamaji, Takamatsu, JP;
Masayuki Hatano, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
The Kansai Electric Power Co., Inc., Osaka, JP;
Electric Power Development Co., Ltd., Tokyo, JP;
Shikoku Electric Power Co., Inc., Takamatsu, JP;
Abstract
A small-sized arrangement for a DC circuit breaker with a reactor and a capacitor connected in series is provided which includes a DC circuit breaker, a parallel impedance means with a suitably determined inductance and a suitable capacitance less in value than the inductance, and an energy-absorbing element. The parallel impedance means has a parallel reactor of a carefully selected inductance and a parallel capacitor of a smaller capacitance value. Determining the inductance and capacitance values of the parallel reactors and parallel capacitors employed in the parallel impedance means to satisfy a certain condition defined by specific formulas can cause the DC circuit breaker to take full advantage of the inherent performance thereof while allowing the interruption time to remain minimized, thereby achieving enhanced interruption performance. Since the capacitance of the parallel capacitor is rendered relatively smaller, the device can be small in size and low in cost.