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(11)    Patent No :    AP 2768   
(21)    Application No :    AP/P/2008/004439   
(22)    Filing Date :    12.09.2006   
(24)    Date of Grant &    25.09.2013               
(45)    Publication :
(30)  Priority Data       
(33) Country    (31) Number    (32) Date
GB    0519163.0    20.09.2005
(84)    Designated State
ZM   ZW
(73) Applicant(s)

ADVANCED MINERAL RECOVERY TECHNOLOGIES LTD,

Trident Chambers, Wickhams Cay, Road Town, Tortola,
United Kingdom
(72) Inventors

VERMEULEN Theunis Johannes, South Africa

PERRY Kevin Phillipe Daniel, Portugal

(74) Representative

GALLOWAY & COMPANY

ZIMBABWE
(51)  International  Classification   F27D 11/10 (2006.01)    F27D 19/00 (2006.01)
F27D 21/00 (2006.01)    HO5B 7/148 (2006.01)
(54)    Title

Control system for an arc furnace

(57)    Abstract

A control system for and method of controlling a vertical position of at least one electrode of an arc furnace, where the arc furnace comprises a furnace transformer having a primary, input side and a secondary, output side which is electrically connected to the at least one electrode, the control system comprising : at least one current -measuring device for measuring a current as drawn by the arc furnace; a voltage-measuring device for measuring a voltage

as applied across the are furnace; and a control unit for dynamically determining a setpoint for the vertical position of the at least one electrode based on the measured values of current and voltage, and providing an actuating output for driving a lifting arrangement to adjust the vertical position of the at least one electrode so aslo follow the dynamically-determined setpoint.

(56)    Documents Cited :    US5204872 A    US5255285 A    US4324944 A

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