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:
Apr. 07, 1998
Filed:
Aug. 06, 1996
Hiroki Ito, Tokyo, JP;
Takashi Moriyama, Tokyo, JP;
Kenji Kamei, Tokyo, JP;
Suenobu Hamano, Tokyo, JP;
Etsuo Nitta, Tokyo, JP;
Kazuhiko Arai, Tokyo, JP;
Naoaki Takeji, Osaka, JP;
Koji Takahata, Kagawa, JP;
Masayuki Hatano, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
The Kansai Electric Power Co., Inc., Osaka, JP;
Shikoku Electric Power Co., Inc., Takamatsu, JP;
Electric Power Development Co., Ltd., Tokyo, JP;
Abstract
An objective of this invention is to provide a DC circuit breaking device having functions for transmitting direct currents to an electric power system and interrupting direct currents to the electric power system under abnormal conditions such as grounding and short-circuits, where the DC circuit breaking device can minimize the capacity of a condenser for the commuting circuit while rapidly changing the arc voltage to cause arc currents to be quickly extended and vibrated in order to interrupt direct currents in a short arc time. This DC circuit breaking device includes a main DC circuit breaker for interrupting the transmission of direct currents to an electric power system and a DC circuit breaker that is connected in series to the main DC circuit breaker and which is smaller than the main DC circuit breaker. The circuit breaking device also includes a commutation circuit that is connected in parallel to the DC circuit breaker and the small DC circuit breaker which are connected together in series and which is constituted by a reactor and a condenser. The circuit breaking device also includes a surge absorber for absorbing a surged voltage applied to for the condenser.