METHOD FOR DETERMINATION OF PARAMETERS OF INDUCTIVE INTERACTION BETWEEN PHASES OF THREE-ELECTRODE ELECTRIC FURNACE Russian patent published in 2001 - IPC

FIELD: methods for determination of parameters of polyphase AC electric furnaces, in particular, methods for determination of parameters of inductive interaction between the phases of multi-electrode arc AC electric furnaces, applicable in automatic monitoring and control systems of electric operating condition of electric furnaces used in ferrous, non-ferrous metallurgy and chemical industry. SUBSTANCE: the method consists in the fact that measured are the instantaneous values of electrode current derivative with respect to time di_j(t)/dt, and the instantaneous values of phase voltages u_j(t) on the side of the transformer low voltage of each phase of the electric furnace during the whole period of current variation; discriminated are the signals proportional to the first and third harmonics of the electrode current derivative and phase voltage for each phase' determined are the in-phase components of these signals with respect to each harmonic of the electrode current derivative for each electrode taken separately, and, according to these in-phase components, calculated is the value of parameters of inductive interaction between the phases of the three-electrode furnace by solution of a system of algebraic equations. EFFECT: expanded functional abilities. 1 dwg