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. 02, 1996
Filed:
Sep. 20, 1993
Applicant:
Inventors:
Morihiro Kubo, Hitachi, JP;
Yukio Ishigaki, Hitachi, JP;
Takeshi Itoh, Nagoya, JP;
Hirokazu Misawa, Nagoya, JP;
Assignees:
Hitachi, Ltd., both of, JP;
Chubu Electric Power Co., Inc., both of, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
327368 ; 327365 ; 327366 ; 327438 ; 327442 ; 361 19 ; 361 91 ;
Abstract
In a superconducting energy storage apparatus including an AC-DC converter unit, a superconducting coil, a quench protection unit and a mechanical type persistent current switch, a self-firing type thyristor switch is connected in parallel to the mechanical type persistent current switch to be first operated in the event of an occurrence of trouble in an associated electric power system, and a control unit generates an ON instruction signal for turning on the persistent current switch so as to immediately establish a persistent current mode.