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. 14, 2021
Filed:
Jul. 24, 2017
Primetals Technologies Germany Gmbh, Erlangen, DE;
Abstract
An electric arc furnace () operated with alternating current has a converter () which converts mains voltage (U), into primary voltage (U') having a furnace frequency (f′). A furnace transformer () transforms the primary voltage (U′) into a secondary voltage (U″), supplied to electrodes () in a furnace vessel () (). They apply electric arcs () to a melt material () in the vessel (). The secondary voltage (U″) is also supplied to a capacitor assembly () on the output side of the furnace transformer () and the furnace transformer () is connected on the output side. A control device () controls the converter () such that a primary voltage (U′) output from the converter () to the furnace transformer () has a furnace frequency (f) of least ten times the mains frequency (f) and/or greater than 1 kHz.