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:
Jan. 21, 1992
Filed:
Feb. 04, 1991
Applicant:
Inventors:
Nils-Johan Bergsjo, Vaster.ang.s, SE;
Birger Drugge, Vaster.ang.s, SE;
Lars Liljestrand, Vaster.ang.s, SE;
Emile Schreurs, Vaster.ang.s, SE;
Assignee:
Asea Brown Boveri AB, Vasteras, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ; H01H / ;
U.S. Cl.
CPC ...
361 11 ; 361 13 ; 361 19 ; 361 58 ;
Abstract
A fault current limiter according to the invention comprises a contact device (K) to the contacts of which is connected a resistor/inductor combination comprising a series connection of a first (R1) and a second (R2) resistor as well as a third resistor/inductor (R3) connected in parallel with the series-connected resistors. The second resistor consists of a resistor with superconducting properties, dimensioned such that the change from superconducting to normally-conducting state occurs when the critical current density of the resistor is attained.