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:
Oct. 28, 1986
Filed:
Oct. 30, 1985
John A Persson, Gibsonia, PA (US);
Ross E Andrews, Bethel Park, PA (US);
Michael A Maola, Pittsburgh, PA (US);
Lectromelt Corporation, Pittsburgh, PA (US);
Abstract
An arc furnace electrode control includes phase angle measuring devices connected respectively for producing a phase angle signal functionally related to the phase angle between the primary electrode voltage and current. A bias circuit is coupled to the primary of each phase for producing a bias signal functionally related to the reactive volt amperes delivered to the electrodes. Null detectors are coupled to each phase angle measuring device for receiving one of the phase angle signals and to the bias circuit for receiving the bias signal for producing a control signal for each phase related to the difference between the respective phase angle signal and the bias signal. A control is coupled to each null detector and is responsive to each control signal for individually positioning the respective electrodes in relation to the furnace so as to achieve preselected phase angles.