F - Mech Eng,Light,Heat,Weapons – 27 – D
Patent
F - Mech Eng,Light,Heat,Weapons
27
D
F27D 19/00 (2006.01) H05B 7/148 (2006.01) H05B 7/156 (2006.01)
Patent
CA 2091091
ABSTRACT OF THE DISCLOSURE Direct current arc furnaces (8) have a current regulator (14) for maintaining the current of an arc (10) constant, and an electrode control (18) for affecting the position of an electrode (7) of the arc furnace (8) and thus the length of an arc (10). Control of the position of the electrode (7) is effected by means of a hydraulic electrode adjustment device (21), which is controlled as a function of the difference between a predeterminable electrode control input signal (.alpha.soll) and an actual rectifier value signal (.alpha.ist) at the output of the current regulator (14). In this way the length of the arc is controlled in such a way that a rectifier (5) operates with a mean control of for example, 25° el., independent of the secondary voltage of a furnace transformer (2) and of a set current reference value (isoll). Limit values are monitored and undesirable frequencies are filtered out by means of a band-pass filter (16) between the output of the current regulator (14) and a comparator or adder (17) for forming the difference signal between the electrode control input signal (.alpha.soll) and an actual rectifier value signal (.alpha.ist).
Asea Brown Boveri Ltd.
Swabey Ogilvy Renault
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