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:
May. 12, 2009
Filed:
Jun. 13, 2005
Ursaus Kruger, Berlin, DE;
Ralf-reiner Volkmar, Oldenburg, DE;
Ursaus Kruger, Berlin, DE;
Ralf-Reiner Volkmar, Oldenburg, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
An electrical current limiting device has a superconductive switching element. Unlike prior art superconductive current limiters whose switching mechanism is based on a quenching of the switching element, the inventive superconductive switching element is designed in such a manner that it is in the Shubnikov phase when the required short-circuit cutoff current is reached in the event current is limited. This enables the switching element to be operated in an operating state in which the generation of heat is limited to such an extent that the coolant surrounding the superconductor is able to completely dissipate the heat whereby achieving a stationary state at T. A quenching of the superconductor, which is associated with an exceeding of T, can thus be actively prevented so that, after an event in which current is limited, the superconductor is not required to be removed from the mains and recooled.